Uh oh sounds like a full house, not a bad problem to have though
Sorry if I missed this, but why were you thinking of downsizing to a 400?
Hah, that's some good learning experience there!
Have you peeked to see if there are roots yet?
Time flies when you're having fun though. This is a great hobby. There are aspects that can be applied to everyday life. Plus there will be a market for boutique flowers whether or not Prop 19 passes.
The heating pad is purported to add the extra little bit of environmental control that gives the baby cuts that just right condition for rooting. Set it at 78° and forget it for a week if moisture stays constant in your box/bag getup. This is one that I want to see work out as planned or better.