I have MM & MM2 10k grease,, I have ran them hard, from injection mold cavities running 10K for 70+hours straight, but for the past 5 years I have used both of them with Korloy 1.5" Pro-X indexables.
They have been chewing 70-100 gallons of chips a day for most their lives. Running real hard, new inserts are programmed at 80% spindle load, they last about a month coming up to 100% load.
And on endmills, depends on ones opinion, I have worked at shops where they run them until they break, which is years.
You can run them until they start to leave burrs, ,which doesn't take that long.
And on a YG1 with the polished flutes, it leaves a smooth mirror like finish, if you want to keep that finish you will have to change them more often.
But also depends how you program, I use a 35-37° for HSM/roughing then a 40-45° for finish, So depends on if your using the same endmill for everything.
Coolant I like Oemeta Novamet 910, why because we do make 7075 Aluminum Injection molds, and this coolant is non staining on aluminum, but also
we have a Nakamura lathe with box ways, this thing chews through way oil, and I didnt want to deal with all the oil in the sump, Oemeta makes a ISO slide way oil that is made
from the same formulation as the coolant oil, So when it gets in the sump it just increases you coolant concentration, you just add lower concentrations on fill up.
One thing that could help also is the length of the tools, try to go short, decreases the leverage of the tool to the bearings.my longest tool holder only has a 1.75 gauge length.
I would say for a short hydraulic holder use the Schunk Tendo, but the carousel slide covers will hit your tool shank its so short.
hope this helps.