There are some massive threads on this forum (and others) about dermarolling, though results are a bit sparse. Some people are certainly fanatical about it though. I wouldn't venture past the first few pages of the 400+ page thread about it on this forum because its an absolute train wreck with less decent content as the thread goes on. There is a results specific thread that is a bit better.
In some cases sides might be an encouraging thing. Some people are caking their head in minoxidil and getting no sides and limited growth. Personally the difference between applying half a cap of minoxidil and 2/3rds of a cap can be huge in terms of sides, but I get quite dramatic results in terms of growth from it. Sounds like finasteride had a similar effect with you, almost too effective. I'm curious, did you ever try taking finasteride as little as once a week? I've seen some charts which suggest it takes 6+ days for DHT levels to come back up and I've heard anecdotes of people maintaining for years with a single finasteride dose every 7 days.