I always try to use the lowest rings I can when mounting a scope. It seems the closer you are to the centerline of the bore the better off you are. But you have to consider clearance on the hammer with TCs, and since often hammer extensions cause trouble I like to keep the scope off enough to allow cocking. You also have to consider where the scope mount and rings leave the scope in relation to the stock, and how it fits your face. You want a good cheek weld that keeps your eye centered in the scope. If you wind up lifting your head you will learn soon about paralax problems. If the scope has to be mounted high for some reason (like a large end bell or some obstruction on the barrel) there are several options for building up the stock. One is the lace on leather pads, but I prefer the hard rubber glue/screw on type that comes in several sizes.
Hope this helps.
