C-planet are the best converters and seem to have very good retention month in and month out. Also you will make a ton with Bodog’s casino. After that I’d go with Casinocoins (Nick is really cool manager) and their non US sister site is VIP.com and then Bestcasinopartner.
Conversions are tricky with casinos accepting US players. You have to watch it literally on a monthly basis to make sure you’re maximizing your potential. The reason…depositing options changing per casino. You can get some amazing conversions if you watch it close enough.
Hope that helps!