Iscar parting inserts KICKING MY BUTT. Need some input!!!!!

Details: Haas st30, high pressure coolant, iscar tag N4c inserts, 1.375 diameter 316 ss, .551 hole thru.

I have run, 808, 809, 907, 928, 807 grades, and none of them work. Ive run sfm from 200 to 500, at everything from .003 - .007 chip load. Im using an Iscar Camfix, ( like capto ) holder with high pressure coolant thru the tool. Its parting right next to the jaws, and is as solid as a setup can be. 15 parts is our best! This is ridiculous, and I have no more hair to pull out. I have an Iscar rep coming out late tomorrow, but cant afford another day like today. We are throwing inserts at this job like there is no tomorrow. I have 1200 parts to run, and we are off to an awful start. Tried with and without coolant. Centerline of the machine is spot on. Part is only 2 inches long, with 2.5 stock sticking out of precisely bored steel jaws.

My only thought is, that with the constant surface speed, Ive tried clamping the spindle everywhere from 1500 - 2200 with the g50. I can safely run this material up to 3000, should I clamp it there, or will this just burn thru the inserts faster?? Any insight would be GREATLY APPRECIATED!!

Thanks,
Gary