I would first ask what type of Whisker Biscuit you have. Adjusting the rest will be easiest with the Deluxe. In any case, I would mark the rest in some way to show me where it is right now if I ended up making things worse. Logically, the rest should adjust to the right to get the impacts together. With the Biscuit though, you may end up moving it the wrong way. I have found that you can get a tail right (point left) arrow when the rest is too far to the right, and the fletching on the left side encounters more resistance going through. You would want to adjust the rest in small amounts, about 1/32 " or so at a time. Then shoot a few groups before deciding if you need to move it some more. I had a similar problem last week when tuning broadheads, though my broadheads were flying about 2" high at 20 yards. I moved the rest down 1/2 mark on my QAD rest, and it all came together. The move was less than 1/32 ", but that was all it took. Your fp arrows and bh arrows are both currently grouping well, so don't move anything too much, 'cause you are pretty close right now.