Thanks for that.
The action is favouring the right side, the draws are heavily marked here in relation to the left side.
The action when locked up is pulling down also on the right, as can be seen by the shot of the front receiver seating.
To my way of thinking, this means your barrel is pushed to the right of centre in the channel.
When the nosecap is fitted, it tries to pull the barrel to the left and down, as the major timber support for the nosecap is at the bottom, the tension created by the barrel twists the nosecap and subsequently, the fore end of the timber, which in time creates a permenant twist to the forewood.
The draw problem needs to be corrected first, once the bedding is correct and the barrel sitting square, all else corrects itself, the twist identified in your pic of the barrel channel, is not sufficiently extreme enough and if you ensure adaquate channel clearence up to the front timber bearing points, the twist will correct itself.
A soak of BLOwill never go astray either.
.......just my thoughts, feel free to ignore them.