^ dis.
Sort the compression, good barrel (doesn't have to be fancy nor expensive, it needs to be STRAIGHT and have a good internal finish) and good hop. Tight bore vs wide bore is an eternal debate, I'd keep it to 6.05/6.08 internal diametre so that you have a good compromise between efficiency and reduced chances of the bb bouncing inside.
Assuming you're talking about your VSR and if you haven't already, get a TDC.
It vastly improves hop consistency, applying direct pressure on the tensioner, rather than having leverages that can flex. The flexing is minimal but you want to remove as many variables as possible that can mess up your shot.
Energy output isn't everything to be fair, the difference between a 2J gun and a 2.25J gun is negligible so even if you're not bang on the limit it's not too big of a deal.
Also, most important thing: use good bbs. They are expensive, but with a bolt action it's not like you're dumping thousands per day.
After that, every improvement has to be done from the shooter's side don't blame the gun if you can't hit shit