There has not been any issue with T-Rex mod. Community mates are very happy with it =)
But the sp-mod #2 is faster and use less power on the 1080ti. 34MHASH @80% .
The T-rex miner needs 100% power and max 32MHASH. The t-rex miner is not free because it has a buildt in fee.
The current mining meta involves lots of algo swapping; the 0.05 btc fee is therefore off-putting. You could consider to remove 0.05 btc initial fee and increase the 2% fee so that at least your miners are getting more exposure.
Currently I only see that big farm would consider to pay 0.05 btc.