If it were my stock I would remove the action and either buy some "spotting compound" from Brownells or make my own from oil based paint thinned with 3-in-one oil. Something in a light color.
http://www.brownells.com/gunsmith-to...-prod7599.aspx
Apply a thin layer of the paint/compound to the action, making sure it's both a thin layer and evenly applied. Just the lower half of he action is all that needs to be coated.
Set the action into the stock and squeeze it into it's fully seated position in the stock using your hands.
Remove the action then examine the bedding for marks from the spotting compound. Ideally there will be continuous contact visible as indicated by a uniform transfer of the paint
If there is only contact at front, center, or rear, then the bedding is not uniform when not under stress. When action screws are torqued the action itself is being distorted and/or stock is being "warped".
My guess is that it will need a complete re-bed to correct the issue.
When bedding it's essential to make sure there are no high spots in the stock first. Then, when the action is set in the bedding compound the action screws not be torqued. Action should merely sit in the bedding compound and be held in place with surgical tubing wrapped only tight enough to hold the action in the bedding and down against the reference points (Pillars, action block, etc).
As for fiberglass stocks "warping", any material can warp. Fiberglass is merely a reinforced plastic resin and if subjected to heat and stress, it can definitely behave like it's warped.
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