Over torquing those screws and bolts, eventually cause the holes in the stock to wear into "eyes" over hundreds of cycles (including cocking) and gouge up a nice channel as well.
Roughly 45 Lbs to cock that piston with a lever, imagine the (dual) recoil.Most bedding jobs are on powder burners that generate a "mono recoil" if you will, so even glass bedding might come undone in a 'loose channel'.
Pillaring might come apart too since even that lug is loose in the stock channel & not enough stock material to brace for pillaring against linear recoil.
A "D" shaped slat of suitable non expanding wood or Delrin (to custom thickness of gap between action & stock channel heel) will effectively fix the root problem, you won't have to over torque anything & can still bed the rifle if so inclined
Remember once you bed it - it is harder to dismantle vs the gap fix solution. If anything, NPXLs major adjustments to the stock should be the comb height!
It s RIDICULOUS unless you have a GIANT head. Close your eyes & shoulder your gun - now open & see how far you have to lift your face to align your eye with the scope.even with the LOWEST mounts with smallest Objective lens on a 1" tube, it is too much.
If that comb height lent itself to a more natural line of sight, one may not have to spend hours on the elusive "Artellery hold"
As for lack of accuracy, try shooting a few groups without the shroud - smaller groups without it means incorrect torque on shroud when it was on.
I have used epoxy at the bottom of shroud (breech end) helps a bit but it is a fine balance to get the right torque that prevents the shroud from loosening during shot cycke or when cocking (unless you are a Lefty & then you are inadvertently tightening every time you cock it)
Keeping it too tight stretches the barrel taught inside the shroud & it resonates differently each shot causing inaccuracy. Best to test for repeat-ability sans shroud however, no difference, could mean a host of other issues including poor breech seal, loose barrel at the fork,
stock screws, action/stock fit, crappy leade &/or crown, lacking comb height, broken scope, loose mounts, not enough hours toward infinity spent practicing the "A Hold"
Hope I have shed some light !
Happy holidays