Hi!
About the PHI algo I read on this pool that the most used is the SPMOD1. Is it the paid one? Or the free one?

No free lux mod by me. My work has been stolen and spread as usual... So I need to make lux sp-mod #2 with a small fee and improved performance. This is difficult because lux sp-mod #1 is pretty fast already.
You should consider provide miners as a service. For example collaborate with some pool that functions like Nicehash. And VIPs of the pool get the latest optimized switch miner everytime they connect.