hello i today bought a gen 4 27 love the way gen 4s feel in my hand. also on the 27 the hump hits my had it a great spot so it feels great. i have a 23 also i carry 180gn ammo hst or gd... just wanted to know if i should just stick there or get some 165 or 155gn ammo for the 27..???? ..the gun store guy tols me too stay away from 155 due to recoil but not sure. what do you guys think ?? thanks ..