A Hamster in match shooting is a small furry animal, I think that's cruel to attach one to a rifle, its an expression from FT, in match target shooting its the fore end.
The maximum depth of the fore end in Air rifle 10 mt match shooting has just been changed this year (2017) to 120 mm from bore line, it was previously 90 mm. This will help taller shooters and those with long necks, but will make little difference to the average shooter. I suspect your hunched up position is a result of you (in simplistic terms) taking your elbow to your hip, and hunching forward over the rifle and trying to muscle the rifle still.
But even with a shallow fore end it is possible to form an un hunched and stable position for the average body shape, so don't butcher your classic rifle yet. (I wonder if there's a good book that could help you?)
The most stable position is to bring your body weight rearwards with back bend and with the head upright, some men can reach their hip with their elbow, most rest on their gut/rib cage. Women have prominent hips and short bodies and can rest on the hip, this is why there are specific women's classes, to protect us men, as they are generally more stable and better in standing shooting!
And yes, you really should get a copy of my book!
Have Fun,
Robin
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?