Well, from your description of how you close the action, following #2 should improve accuracy.

How you operate the trigger, making sure there's no oil or solvent on the latch or shelf and where you place the front rest ALL can make a big difference. After those hurdles have been crossed, try shooting it without the forend, that will tell you if the forend is the culprit, see
forend fit in the FAQs for help on that issue.
Tim