Sorry... I'm a bit late to the party!
I hear maxim Oil has the best prices on P50 but I'm not sure if they or anyone sells it by the gallon.
I use 11 second oil for steels in the faster range, it is from McMaster Carr and available by the gallon. It isn't fast enough for 1095 or W2 so I brine quench the blades.
For my brine quench I like to go with 1/8" or thinner stock and quench it pre-grind. I have had 100% success this way... with everything else (thickness, etc) it can vary. I round everything to reduce the chance of stress cracks.
I hope this helps! I wish I knew a good source of Parks 50 by the gallon.
Drill slow - my favorite press runs at 150 rpm. Press hard as feed pressure is key. I run the drill faster with smaller bits too. Norseman bits are good, check USA knifemaker... Ti is just tricky and it takes time to get used to the right feed pressure.
400 might be kind of hard for 1095 tempering but only testing will show.