I wouldn't consider 30-40g mega-dosing BCAAs at all for someone who weighs 215. I'd consider that a normal daily dose. Yes, you can go with 20g a day, as some guys suggest, but I've read everything from 5g a day being enough to people using 80-100g a day.
I use 45g per day, on lifting days only. I cycle off them once every three months or so for a couple of weeks, not because I have any concrete evidence that BCAAs lose their efficacy after this time, but simply because I cycle every supplement. Give it a try, if you like.