You could probably knock 2" off the arrows, install new inserts, and try again. 27" arrow isn't going to hurt you and should match the spine to your bow better. And certainly cheaper than new arrows.
The rest wouldn't be my choice, as I don't like any type of containment, but that's a personal choice. I just feel that with capture rests you have to hold the follow-through more thoroughly.
Broadheads hitting low normally means a high nocking point. Left means a stiff arrow, but this might be backwards. When tuning always take care of the vertical first. Raise the rest or lower the nocking point. Then work on the horizontal. If you move the rest to one side and things get worse then move it the other way. And don't be afraid to turn the limb bolts. You'd be surprised at the results attainable by turning the weight up or down a couple pounds---again, cheaper than new arrows.
Take into account that poundage is nothing more than a number.
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