I believe the VAP TKO's come in a 350 spine which would seems to be the closest match to your draw weight/length. The 300 spine seems a bit on the stiff side for your setup. I shoot 70 lbs with a 31" draw with 300 VAPs and they have tuned well. Have you had any issues tuning the bow with either of the arrows? Tuning could be part of the penetration issue.
If the 300s are coming off the bow a bit crooked, they may be losing more speed that you'd think or impacting the target at a bit of an angle.
Overall, I would expect more penetration from the heavier arrows if everything else about the is the same (shaft diameter, finish, field tips, etc.).
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