This is always discussed and yes I've seen the flat line response curve on over .2 mg finasteride. A lot of people try increasing the dosage, but since the medicine doesn't prove any more potent, do people get results with upping finasteride? Please post your story and results if you have.
Personally I think starting at an EOD or so and increasing may be the only thing to yield results. The whole stop and then start may have some potential too, but I wouldn't risk it as you can have a big fall. I think its either increase frequency, or add dutasteride to your regimen starting at 1 day a week.