Just sent mine in. Down on last month too.
Interestingly, I've been taking some of the advice here and have changed my style a bit, a shift of weight slightly onto my toes. Noticed I was shooting on my heels before. My scores are down, my groupings are better though. The grouping was all low, one and two handed. Don't know whether to compensate or re-sight the pistol? Think I'll persevere as is for now and see if it comes right.
Looks like experiment time