My first regulator was a hydro setup. I'm still using it 20 years later! Mine has a Dwyer flow meter as the valve. You just have to turn it way down, no big deal.
I have a hydro setup as well. I didn't have an issue with the flow meter either, mine is a pain to adjust but it is steady. I have replaced it with a Fabco which is a lot less frustrating but the flow meter actually worked fine. I got mine for free so it was worth it but I wouldn't recommend it now as it is $100 anyway. It does have a real regulator though, single stage though.