go with the weight/balance comments... that's usually why a rifle feels 'long' because it's pulling you out and forward of the ideal. Try getting the butt lower (iin ideal it should be moved from one positional to another, but tricky because you often feel like the scope should move, and normally something like the fore-end as well)... also have a play with butt pull as well.
You can strap some simple fishing or wheel weight perhaps low and back to see if that counter balances. Ideally balance point should be above the support point, which changes for each positional position... you may have to comprimise though. A rifle with the balance point in the same place, but the weight at the far extremities will feel slower and more stable than one of the same weight and balance point but with the weight piled around the centre.
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