Your bow may be advertised at 350 but your actual speed will be far less with the arrow weights you listed. My guess would be you will need a 300 spine arrow to get good arrow flight. If you really want your speed try a 100 grain point rather than 125. Personaly I have good success with the 2inch Blazer vanes and use three of them with a slight offset or angle on them. You could go the helical route as it stabilises your arrow better but slows them down faster. If you can go for an arrow in the 450 grain weight complete. That will give you all the penatration you should need and still a reasonable arrow speed.. As for arrow length if you are a 30 inch draw 30 and a half inches should be a good length. All you need is the arrow tip past the front of the riser some shoot with arrow tip alittle longer than rest but that is up to you. Hope this helps and good luck getting setup. One more thing get a good quality fletching jig it makes life much better and allows for better arrow fine tuning.