I should be able to take 25' of cable and attach it directly to the bedroom TV through the window. I agree I have too much cable in the system, but things like needing 60' of cable, drove me to 100' premade cable. Taking the splitter out of the system gave me a result I wasn't expecting, no change.
I'll order a roll of RG6 and cables and start making cables as short as needed if reducing every thing to minimum lengths. Probably what I should have done in the beginning, but I'm also coming to the conclusion the wire buried in the wall is a concern. I also had someone tell me they had an issue with a TV that was leaking voltage into the F connector and they had to put a splitter on trap the extraneous voltage.