My wife is shooting a Beretta 682 Gold E Sporting, often with 7/8 oz handloads, and has yet to experience any problems. The gun was worked on and has had barrel work (long cones, ported), a premium recoil pad (Kick-Eez Rocker) and the stock fitted (over an inch cut off the LOP).
I'll give my standard advise for any mechanical problems... clean the thing completely. If you aren't comfortable removing the action and cleaning it, then pay a smith to do it for you.
If the gun still isn't working right, have it inspected by a competent smith. There's NO REASON why that gun shouldn't work with light loads. You could pay to have the triggers converted to mechanical, but it's a chunk of money and can sometimes lead to other issues down the road.