agree with tuning and a better broadhead. the sharks are liked by some, but they were shown to be poor penetrators by Ashby. If tuning is good, change broadheads and make sure they are razor sharp, those landsharks are difficult to really get razor sharp, I have tried and no longer use them. JMO good luck
Nock left is weak. That much weight up front needs a stiffer arrow in many cases. you really dont need that much up front, but it doesn't hurt if you can shoot it.
the bow cut wherever really has no bearing on anything other than you just need to tune your arrow in. Cut to center bows generally take a stiffer arrow, and can shoot more ranges of spines. If they are not cut to center, the arrow must bend more to get around the bow, so a weaker arrow spine is necessary. really, with a ton of weight up front, you need to start looking at arrows one spine range higher just to start, and may need more depending on the length of arrow. spend time learning and trying now so that when the summer is almost over you are ready to go.