shotgun pitch?

i heard that a shotgun's pitch (which was defined to me as how much the barrel strays from a vertical line when the butt is placed on the ground) affects the amount of perceived recoil... i just added stock spacers on my mossberg 500 to raise the comb and in effect reduced the pitch to almost none. (i got the gun as a hand-me-down and when i fit it, all i saw was the rear of the receiver). as i would have it, this should reduce the recoil, right? and if that is true, it seems like every shotgun variable that reduces recoil (autoloaders, low-velocity or low weight rounds) has at least one draw-back. does lessening the pitch have one? thanks ~eric