If you want 80lb limbs, I say go for it. Talk to your dealer and have him order you a set. Then sell your 70 lb limbs for most of what you paid for new ones if the current ones are in good shape. Bows are expensive and you should get exactly what you want, nothing less.
Although, it could be worse. My wife bought me a mint condition used 70lb Carbon Defiant Turbo last month for my birthday last week that only needed new strings. I had it sitting on the floor of my weight room next to my old bow while I waited until my special day so I can put on new strings and shoot it. My wife clipped the lower limb with her motorized wheelchair and damaged the outside tip. I didn't realize how bad it was until I already put the new strings on and that chunk just fell off revealing a crack forming after the first shot. I superglued it to hold it together for now and will be calling shops on Tuesday to order new limbs. I am hoping Hoyt will sell me higher deflection limbs to get me closer to 75 lbs or even 80 lbs for my Turbo since they built Cam Hanes a 90 pounder for his buffalo and bear hunts. I'm a small guy (5'10" and 165 soaking wet), but I practice an hour almost everyday and that has paid dividends in how much draw weight I can pull. So even though I'm out even more money, hopefully I will have my ideal bow. As far as my wife is concerned, it is all shipping damage. Today was our 12th wedding anniversary and I've learned enough in our twelve plus years together that you don't tell someone they damaged the best gift they could ever get you before you even had a chance to use it. Just swallow it up, pay the bill, and move on. It could be worse....
Sent from my iPhone using Tapatalk