Bowtech fall away

I started bow hunting two years ago and i went out and baught a Bowtech Tomkat brand new and it cma with a fall away rest and i am haveing trouble with it leaving black rubber marks on the fleching on the arrow i took it to the shop not to long after i bought it and they said they fixed it and its not that big of a deal. I practice in my back yard alot and i have not yet taken any thing with it yet and it seems that the grouping is not consistant. it will shoot like 3 or 4 in like 3 and half inches and the one will not even hit the target i am thinking about gettting rid of the fall away and use a whisker biscuit. do yall think this will solve the problem or should i take it to a new shop.

Take it back to the shop you bought it from and tell them that you are still getting fletching contact that you don't want. If they again tell you that it is not that big of a deal, just tell them "yes it is."
You are the paying customer and should not have to deal with a rig that is getting fletching contact and giving you tuning nightmares!