If 1mg is the dosage prescribed to normal men to combat hair loss, I would imagine you would need more, especially since finasteride only blocks about 60-70% (?) dht. Also, I do recall reading a study that the response time of a dosage is relatively slow (compared to dutasteride), so by upping your dosage you wont necessarily be stopping hair loss right after or even preventing it when starting it on day 1 of your cycle.
I tried finasteride (research chem) on my very first cycle (TE 500mg/wk, ND 300mg/wk), right from the start and used 1-2mg ED. I was losing hair before cycle and continued to lose it on-cycle. HOWEVER, continued loss on-cycle may have been due to the fact that I was running Deca at the time as well (I didn't know any better then).
Regardless, what I started using after, both on-cycle and off is dutasteride (generic human grade) and I have seen very good results. No shedding during my cycles (Test 625mg/wk) and obviously none when I'm off. I'm planning on running a big test cycle like you and have been considering taking at least 1mg of dutasteride a day.