Hey JC,
I mentioned my RT + Bushi team to you in a previous post. If you search this title, you will see the speeds for each champ and some comments.
"ROSHCARD + BUSHI UK COMP SPEED SUGGESTIONS (UPDATE)"
This last week I have added Farhakin the Fat (instead of FB) to my team and have been able to 2 key a couple of times. I need to tweak damage from 3 dps, or 6' Bushi and get Warmaster to make it consistent.
You can choose the 3 dps champs, from what I see on your roster FB would be your poisoner, Septimus can extend the debuffs, and then a consistent dec def champ that does not have any TM in their kit. Not familiar with all of your champs to know who you have, I use Rhazin for dec def.
So, you would need to 6' RT and FB, Bushi can stay at 50 to 3 key UNM. I dont have Septimus, but he might help you to 2 key.