I don't know if you guys are doing this or not. If you will take your stack of plates and put the whole stack in a vise, then use a clamp to clamp above your hole. Then when I drill, I use three bits. You need to push hard to cut stainless. You can tell when you are pushing hard enough, for it will be cutting metal. don't let the bit get to hot, every few seconds use some lube. The only deburring you will need to do is on the last plate.

The key is pushing hard enough to cut some metal. If it is not cutting it is heating up and will destroy your bit. I have did about 75 plates 304 and 316 with the same bits. Titanium high speed from harbor freight.

Marlin