VICKERS RV1-12-S-0-8.5/

Poppet designs tend to handle high-cycle duty a good bit better than spool-style valves in a lot of applications, and that's exactly the kind of environment this valve was built around. Refuse haulers are actually listed as one of the target applications, so the construction accounts for the repetitive demand those systems put on pressure control components. You're getting regulation up to 350 bar (5000 psi) with flow capacity up to 300 L/min across the RV1-12 series, so headroom isn't likely to be your problem. The poppet style also contributes to more consistent pressure response cycle after cycle, which should help with those spikes you're describing.