Muzzle bearing pressure. I would cut out a 1.25" long x 1/2" wide section at the muzzle and insert a wood patch. Radius the top to suit the old cut-out muzzle bearing and rad of the barrel then slowly start to lower it until the barrel bearing comes down to the weight required. But don't go any further if the barrel isn't central in the muzzle end of the fore-end as you have already passed the point of no return regarding any further correction of that particular problem.
I think you were a bit hasty with that, er........., fugly* washer at the front trigger guard screw. You could simply have used a reinforcing plate as per the L42 rifle and be done with it.
Handguard touching the block band foresight. Simple. Move the BBFsight forwards a tad to get clearance or just dolly/reshape the metal end cap to achieve the same
* FUGLY. A particularly Australiantechnical phrase used to describe your friends latest girlfriend