actually, it depends on the ski, mounting to far forward will fuck up the sidecut...I.E. the ski won't flex right. if you notice you have more sidecut and a less symetrical ski (k2 enemy type) then mount 1 or 2 back
If ALL your doing is park mount +2 or +3. You can still ride switch fine but you get better handling regular too. You should get out of hte park a little bit, but if your just getting a pair of park skis and a pair of all mountain, disregard my last statement
hella no take them back to your shop and get them remounted. ive seen them mounted were it is suggested and it look absolutly rediculous. get them mounted at atleast +3 cuz even there they are far back on the ski