There are a few things that don't always automatically help-but don't hurt either. The Howa don't have a "floating" bolt head (locking lugs) so lapping the bolt should help.
A good trigger won't make your rifle itself shoot better-but it WILL enable you to shoot it more accurately.
Glass/pillar/aluminum block bedding will enable your rifle to maintain zero better, even through disassembly and reassembly.
Proper scope mounting is MUCH more important than commonly believed-that includes lapping the rings in the case of steel rings to eliminate damage to the scope.
See the sticky thread at the top for more detail.
Sometimes you earthlings REALLY amaze me!