ARP Professional Series head bolts vs. studs?

I'm not having much luck getting my ARP head studs to seal off coolant, so I'm thinking about downgrading to head bolts. ARP's Professional Series is supposed to be a step up from their standard head bolts, but I want to make sure they'll be durable enough. My motor is pushing over 400 hp to the wheels with a 300 hp shot of nitrous.

We're running ARP pro series head bolts on our Camaro, and I've never had a problem. It's running a dual staged NX 350 shot. It's never blown a head gasket, or had any problems. Hope this helps..