My Theoben Fenman has held zero for ten years and just delivers. It could be improved with an HW Trigger and an Omega's scope improved stock. In walnut with some chequering.
My other reach for rifle is a FWB Sport and that just needs a HW Trigger.

I have a Steve Pope fully tuned HW95 and its still flighty due to being FWB Sport weight. Plus still doesn't have a scope orientated stock.

Gasram is a superior power plant than a spring. Keep to farmyard ranges then most can be made to deliver; it only goes to pot when more range is tried. Light weight, spring, and long range, with a break barrel will always have one element that lets the team down. But at least they are a true sporting weight and not some brick.