MrWill, made any progress on your tuning issues? I think I made some progress today, so thought I'd share with you. Hopefully they might help you.
I went and bought new glow plugs for it and went for the OS P7 plugs. These are listed as medium. The ones had been running, I believe, were more on the cold end.
I also decided to try running O'Donnells 30% through it as well (I figured there was no way it could run any worse!)
After a good couple hours running and tuning, running and tuning I believe I finally got her just about dialed in. I'm sitting about 3 2/3 turns out on the HSN, just over 4 turns out on the LSN. As I finished up my day, I was getting good, steady idle (although, it would load up fast, but I think that is simply an attribute of this mill), good smoke at WOT, temps were in the 230-235 range and I honestly was pulling wheelies through all three gears on the Savage, to the point it became annoying.
I also think that I really need to run more tanks through it to get it to loosen up. I think part of my problem with it hydrolocking so easily is that the mill sits for upwards of two weeks between runs. Since it is still relatively new, I think it needs loosened up a bit more.
Hope you're making progress on your end!