I have a similar situation with a Bear Custom TD and matching Grayling limbs, both 60" and 66# with different tiller.
It may be possible to tiller the bow, by removing material on the upper limb to increase the tiller to 1/4", but that is a lot of work and you will probably need to refinish the limb.
However, you may be able to add a shim under the upper limb to change the angle and the tiller. I would start by trying some heavy vinyl tape, like the black vinyl electrical tape that is thicker than the standard tape. Your find it at NAPA Auto parts. Put the tape on the limb then mount the limb and check the tiller. You can experiment a little. If the thickness becomes too much, you will end up with a gap, and flexing when you tighten the bolt. I would advise againts this if you see any flexing when you tighten the bolt for the limb. The stress could cause a problem. I you are unable to fill the gap with strips of tape, I would call the bowyer for his advice.
If the tape works, then you might assume retillering would also work. To get around the possibility of flexing due to the gap, you might find a fiberglass wedge ground to the desired thickness that you could epoxy to the limb.
You did not mention, if you checked the brace height. I would not assume that both limbs are going to perform the same with the same brace height, nocking point etc. Try tuning the second pair of limbs, starting with a low brace height, shoot 3-5 arrows, then twist the string about 5 turns to raise it 1/4". See if you can find the sweet spot for the other limbs, before you retiller. If that does not work either, then you can retiller the upper limb, but it may never shoot to the same point.