Do you have any speed sets equipped? Speed stat can have decimal's that aren't shown and is rounded off so your speeds might be slightly under or over the suggested speed. Try this calculator. Also Affinity matters.

Edit: forgot to mention, when you set speed it will ask about speed sets, which type (divine and regular speed are the same) and how many.

Thanks for that, when I put the gear sets/lore of steel mastery in there, I have:

ME = 240.27, PK = 218.15, Fayne = 175.0, OB = 174.89, and Geo = 120.40.

Does that mean I need to up the Speed of both OB and Geo by 1 each? Or will it round the OB up and the Geo down, so I only need 1 on Geo?

Check the rotation on that speed calculator, that said I think so. I think (could easily be wrong) that it only visually rounds the speed and your actual speed is still those #'s. I had a similar issue when I was setting up a Mantower CB team. My Septimus was slightly under the speed and I didn't notice it. Threw the whole run off and the "unkillables" wouldn't rotate properly. However I know that affinity also matters and he will sometimes try and target based off that.

That said, I'm somewhat new to UNM CB so maybe someone else has a better answer.

I'm not sure what this is showing me....  I tried to make it skip ME's A3 on his first turn, and use it on his 2nd, which I believe is required to make this thing go. But it looks like the stun target is losing protection even earlier than my turn 12 run....how can I fix that?

i

Set the delay to 1 on the A3 of Maneater and the delay to 2 on the A2 of painkeeper. Other than that...I'm really not sure. I was in the middle of setting up budget unkillable the pulled Roshcard and switched to building a Mantower team. That said, i didn't have Geomancer and was going to use Skullcrusher as stun target.

Still I think it might be the speed on OB being low. just change the speed on him after setting the delays and see if anything changes.

I didnt even see the delay thing. The video I saw ( https://www.youtube.com/watch?v=urY8i33WHkM ) says ME should go A1, A3, then can auto. PK should go A3, A1, A1, A2, then auto. DPS and Stun Target do whatever you want until you're on auto. When I set those delays, its showing that the stun target should always have block debuffs. 

I also just learned you do NOT want the life drinker mastery on your stun target. I turned that off, so we'll see if that helps the targeting before I change any speeds, they were a huge pain in the ass to get right lol 

Haha yea setting speeds is hard. In mantower my maneater needed 287 speed to work right, that was extreamly hard to get, luckily I didn't have to worry about defenses, hp or anything lol.

Welp, that didnt work. Stunned ME on turn 9 that time....tried to get him again on turn 12, then switched back to Geo but the run was already fucked. Not sure what to do now....

Finally set the delays right. This is how it should go, ME should place unkillable/block right before the AOE1 goes off, everyone lives through that and the AOE2, Geo is so slow his buffs last through the stun round, and away we go.....just can't figure out why the CB is targeting ME for stuns. The Rust calc shows he should be targeting Geo every time. There are no finicky masteries. Its not an affinity thing if the CB is void is it?

i

Not affinity then. I'm really thinking it's the speed on OB. hard to say without actually testing it though. with these builds if any champion's speed is off it could throw the whole run in dissaray. That is just a guess though.

at the time of placing the stun hit who has the lowest HP?

if man eater then i expect that could be the issue if hes not then not sure im having similiar issue on magic cb goes after maneater if his HP is lower than the stun target, my man eater only gets small heal from his a1 and main heal from PK 

Unless you changed the HP levels on your team since the original post above, my take is your Geomancer needs significantly more HP and lower def wouldn't hurt either. 

stun target def under 1500 mines around 1400 and highest hp - but im sure your already on that 

This is good advice here for helping with that stun targeting.

i took MEs hp down a touch and increased his def a bit, and put what hp i could into Geo. it was working fine until about turn 15 when for some reason PK took an extra turn right before an AOE and died........i put one of the new banners on her that has 5% chance to counter attack, and her A1 fills her turn meter....FML i dont have another banner to replace it, and it has HP and a double speed roll.....