Question for all you knowledgeable upstream single-stage Mistral aficionados.
At 2500 psi, at 2000 psi, at 1000 psi and at 750 psi my Mistral locks up tight (i.e. levers removed and nothing touching the pin). However, below 750 psi the HP seat leaks. Correct me if I'm wrong, but isn't the spring tension holding the seat in place constant regardless of tank pressure? It's a new spring BTW that came in a VDH kit. What am I missing (again showing my ignorance to basic regulator everything. Thanks in advance.