Thanks guys for the fast responses.
I wouldn't do a walk away split until there are a significant number of drones flying and the colony is in buildup mode and the colony is at least the equivalent of two deeps full of bees and brood and honey.
That's about where I'm at. I checked out the link. What I called a walk away you called an equal split. I guess I've got my terminology wrong. I don't know if that makes a difference or not. I've already added a medium super of foundation on each colony. I'll be feeding this week to get the frames drawn out and build up the population. Then when the warmer temps come I'll split and relocate. The goal is to turn 5 very strong into 10 fairly strong colonies when the main flow starts. I have three location to put them on that should be good foraging. I believe the flow begins here around the first week of April.
if you guys see pitfalls in what I'm planning let me know. Thanks again. You have all been a lot of help.