Awesome info Nathan. Yeah. 2 runs of coax with the connectors already installed will make it tight. LMR400 is already 1/2" I had not considered running 2 conduit up the mast. Hmm.
I was hoping to run a single one at the front and drill holes into the conduit where the Steaming and deck light wiring holes are. Compression tubes are what I saw then! I vague remember seeing something up there when I was removing 8.5 feet of spray foam that some previous owner had put in from goose neck to maststep. (2 inch pipe with the end cut like a hole saw and a lot of struggle got it out) I am heading to marina today to see what is what and I figure I will just get the conduit on the next trip. Your method of conduit install should work better then making a hook and like riggers do. We shall see.