I guess I don't see the reason you have to play a 4 color base with Recruiter. Sure it's a dead card per-combo, but having a 2 card combo instead of 3 should more than make up for it. And with the recruiter builds all you need to do is get Dreamstalker, return Recruiter, get Harpy, return stalker and recruiter, Recruiter to get strix and win. It's a lot simpler and more efficient than having to play Oracle/Raven/Strix to draw your deck, and you still have that as a backup plan if necessary.
Playing 4 colors allows you to cast Recruiter, but it's not like you have to bend over backwards, I'dplay maybe 1-2 red sources max, you typically don't wanna burn half your combo to get a draw spell. If I were to play Recruiter I'd do something like this:
4 Misty Rainforest
2 Verdant Catacombs
1 Polluted Delta
1 Wooded Foothills
3 Tropical Island
2 Underground Sea
1 Bayou
1 Taiga
1 Volcanic Island
2 Forest
3 Island
4 Aluren
4 Cabal Therapy
4 Ponder
4 Brainstorm
3 Force of Will
4 Intuition
1 Chain of Vapor
4 Imperial Recruiter
2 Cavern Harpy
1 Dreamstalker
2 Parasitic Strix
1 Man O' War
3 Wall of Roots
2 Raven Familiar
It may be terrible, but I think it could work.