Hello Noa.The best stroke for black and grey is the 2.8. Regarding give setting, you need to dial it until you find what works for you. Some artists close it all the way no give. Some others let them go a bit yet both settings can give you excellent results. with the 2.8 you can try running the machine faster than usual and soften your hand. Around 8-9V... The trauma part is a mixture of hand pace, machine speed and technique.
Stick to it and try it all.
Every day I see people obtaining amazing results with parameters that I've would've never have dialed. With that said try it all and stick to what suits you.
Hope this helps/
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