Replying to Swing Weight

What's up guys, I have a bit of a tough situation where my Prodigy 3s have been mounted 3 times now so the pivot 15s I just put on them had to be mounted -7 from true. I had them at -1.5 before, so I was just wondering if the swing weight now is going to be terrible enough for me to need to just get a new pair of them.
Bonus question: how much of a difference would 178 vs 184 make if I got a new pair? (I had 178 which were fun but I was pushing them pretty hard, so would the extra stability be worth the weight?)