IMO, you are on the light side, poundage wise but you should be fine, just take high-percentage shots. Also, given your lighter set-up, my 2 cents are to up the odds and use a 2-blade head. It's easy to do, and extra peace of mind, so why not? That's the advice I would give you. If you can't up your poundage, you do the things that you can do, easily, and you owe it the animal. No sacrifice to accuracy. Also would'nt hurt to up your overall arrow weight some. It doesn't take muscle to do those two easy things, and it makes all the sense in the world...and you have plenty of time.