2012 Yamaha F115LA Leaking Lots of Water into Oil

[CLi87]

This one has me completely stumped, I'm working on a 2012 Yamaha F115LA that's leaking a large amount of water into the oil, after a fresh oil change and running the engine for just 3 minutes, the dipstick jumps from the low mark to way overfilled. So far I've already taken the cylinder head off, taken it to the machine shop and they pressure tested it and checked for cranks and did a valve job, put everything back on and all 4 cylinders compression tested at 180psi across the board, that didn't fix the problem so next I pulled the engine and installed a new mid case gasket and re-installed the bolts with Locktite 572 as per the service manual. All bolts torqued to spec as per service manual. Also while I had the engine off I filled the oil pan full of water and let it sit for 2 days and the water level didn't go down at all so I don't think the oil pan gasket is leaking. Other than a cracked block which seems unlikely is there any other place that could let a significant amount of water enter the oil? The engine only has 170 hours and the inside and surfaces all looked like new, practically no corrosion. Is there any way to pressure test the engine? I was thinking either through the oil drain hole or dipstick tube but I don't really have any attachment that fits in either, do they make a special attachment for that?