I think I know what the problem is with hitting high. When you draw the bow the rest raises up to support the arrow. This height is higher than your original rest. To get an eyeball check all you have to do is nock an arrow and then grab hold of your cable slide and pull it back till the rest is raised up. Yoou don't need to draw the bow. See if your arrow sits at the proper height in comparison to your rest mounting holes in the raiser. Or you can leave the arrow off and do the same thing only using a bowsquare to check nocking point height. If the rest is too high there has to be an adjustment where you can lower it.
Draw length too long? I'd be willing to bet it was too long before and you're just getting around to noticing it.