Richard,
There are maybe 3-4 "tips" I can give you right off, for you to try out. The first is to use the cloth on the bias. That means the fibers are running +/-45 degrees rather than 90. The fabric is cut diagonally, in other words. The fibers will be much more able to conform to compound curves this way. (also maybe try the "crowsfoot weave" fabrics) Second, try smaller/cut pieces. Lay smaller pieces into the really difficult areas, then lay a bigger piece in on top to make up the rest of the shape. Another idea is to thicken the epoxy with some colloidal silica to make it more sticky, but this can impede wet-out a bit. A fourth idea is to lay in just a surface layer of very light glass (3/4 oz or so) and let it cure most of the way, or even all the way. Then spray a very light misting coat of spray adhesve like 3M-77 and stick the heavier glass to that. Then wet out with epoxy and blot up the excess as usual.

good luck,
-David