Is the but cap part of the bottom of the split grip" built as one part or is it two parts"? if its not before you epoxy it on you can add weighted trim bands or rig something up to help balance it out. I have seen people put flexcoat inside the rod and put BB's in the tip of the butt of the rod. Not how I would do it but sometimes you have to do what makes it work.

What kind of guides and how many are running. Any time I'm building a rod I know will be used for a slip float or using bigger braid to leader (more bass and saltwater) I like to use recoil guides. You can get away with a much lighter and smaller guide. they also don't have a eye inside the frame for the slit knot to bust out.