Ahh - nice setup! Lot of history/info here:
https://budgetlightforum.com/t/-/30080 - wight's driver, very similar to the RMM one.
Pics in OP, Post #22 showing the solder paste, Dale's pic in post #78
https://budgetlightforum.com/t/-/27210 - my thread on the earlier OSHPark 17mm driver we were using at the time
OP shows the phases for reflow, good reference thread:
post #124: RMM's detail specs on voltage dividers
https://budgetlightforum.com/t/-/31102 - this thread is on the newer FET+1 boards
Also good reference thread - post #149 is a detailed pic (mine), not as good as Dale's though. Hot plate method is better