One recommended way of testing whether there are barrel contact problems is to put a pice of card under just the 2-3cm of battel by the tip of the fore end. The rest of the barrel should be floating then.
My old Ruger 10/22 only had one bedding screw so the tip had to be bedded.
Given that your groups are more circular now it might be w orth trying a known good brand of ammo. Eg CCI sub or HP are alternatives equivalent to RWS in most guns.
Keep doing 10 shot groups as youve only got a couple of flyers in each now.
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