I'm confused...
You say you are not doing cycles but that is in fact what you are doing if you are running Fina for 8 weeks then stopping for 8 and continuing the cruising dosage. You are cycling the Tren bro and it is a protocol I personally would never run.
How long have you been running a testosterone replacement therapy (TRT), "cruising" on the Test C at 250mg?
If you want to "cut", I personally would just up my cardio and maybe up my Testosterone dosage to 500-750mg a week.
Is this your first time using Tren? Do you have anything on hand in case of prolactin side effects from the Tren? Such as limp dick or leaking nipples? Those sides can sometimes happen even if you are running Testosterone with Tren. Also, with that weekly dosage of Tren if you continue it most people would advise to up your Testosterone per week to decrease the chance of side effects and it would be a better cycle/blast IMO.
If you insist on running the Tren, I think you should continue the Test C and throw some Test P in with the mix.