I should also have noted that the teams above either barely by the skin of their teeth completed the stage or as you see in FK & IG takes 180+ turns and above 4:00 a run. 

I'm also about 8 days away from getting Scyl from the login rewards so was wondering if I should just wait on one of either Warcaster/Fayne to 6* and do Scyl as one instead since I'll be getting her well before my clan is able to unlock Brutal+ CB. 

With regards to Dungeon focuses at the moment I would be doing FK/Dragon and Spider. Ice Golem isn't something I really want to be doing at this stage of the game outside of say, Fusions.

Scyl is a fine option for 60, as is Criodan who will be a long term help in dungeons and I think might help you in Spider 20 now as a crowd control option. 

Then I'd get on the gear grind big time to get set up for a proper, long term CB team. 

I don't think you need Scyl for Spider 20. I have a feeling Artak can do the job of taking the boss down on his own, and you'd just need a team behind him. You already have Kyoku, who does a great job of keeping people alive. You also already have Skartorsis, who, being force, will be the priority target for spiderlings on Spider 20. Add in Roshcard and Khatun and you should be set. You'll want to play around with move order priorities to make sure you don't waste moves, but you should be able to take the boss down pretty easily.