whitefire990: really nice job in identifying & executing on this opportunity with FPGAs! I still have a bunch of Spartan6 LX150 FPGA hardware (from 2012, when FPGA-mining Bitcoin was a thing!) but I doubt this type of FPGA can be as profitable as your cards.
Do you have a particular process for identifying which PoW algos are the most profitable on FPGAs? For example you implemented Phi1612... it is not even implemented by tpruvot's cpuminer. It's used by LUXCoin which is a rather obscure coin (#458 on
https://coinmarketcap.com). Did you manually examine hundreds of PoW algorithms to find the best opportunities?
If you have a Zetex 1.15y with four Spartan LX150, a tiny modification to the code will change it from SHA-256 to SHA-224 and it is quite profitable mining Bismuth. Coinosaurus pool can give you the JSON protocol to submit shares since Bismuth pools don't use stratum.
Regarding the algorithms I spent months analyzing every single one to determine which were most suitable to FPGA's. I checked them all.