The actual head, I don't think the slot is deep enough, the driver slips out while torquing. I'm using 15 in/lb which is what I typically use for pistol optics that are direct mounted onto slide.
I'm sure the screws are shotty, but it's all I've been able to find in 6-48 with the length I need. I bought them from Brownells. They have the exact screws I want in 8-40, but apparently don't make them in 6-48.