i tried the same with finasteride....instead of 1 mg i took 5 mg over 6 months (i also take minoxidil 10 mg/ day oral since 25 years).......same as in your case, no significant different results
after i tried dutasteride each day, instead of finasteride..... also no better results....
i take now cb0301, 1 mg finasteride/day...resulted to less hairloss, but i still had.......added only 0,5 mg dutasterid/week, and my hairloss is history (since 1 year)
it seems it`s not the dosage, it`s about the combination