Ground block is positioned wrong. Should be horizontal instead of vertical. Input is always left to right. Splitter should be the same way: Left to right. You have less than a two inch radial bend in the wire. This causes attenuation. Always try to loop the wire around in gentle loops. Never put a ground block or splitter in the verticle position. Not being an ass or being critical. Only trying to help you become a better installer that does some really beautiful work. I am just a fanatic about an install being done correctly and looking damn good. If you can't make it fit in that box, use a bigger box. But, with a little thought, it can be made to fit in that box, and still be correct and look good.
This is CABL.com posting #278915. Tiny Link: cabl.co/mbkIN