The stock is straight to better ride the rear bag. I would just get a taller front rest or bipod whichever you're using that would allow me to adjust for more elevation if shooting up an incline I prefer a 9-13" Harris pod for prone shooting personally.
There are also multipe bag options out there that may help as well https://www.tacticalworks.com/Shooting-Bags/. I can't tell you what HS uses in their stocks though. If the rifle shoots well and the stock is comfortable to you I would get a better shooting set up before I started changing things on the rifle or cutting up a good stock.
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