Try not to worry Rj_91.
I too had Terrible scarring from a H.T.which has since been successfully camouflaged by my Skalp treatment.
It was in my third session that the scarring issue was mainly focused on and,ultimately,addressed to a very satisfactory conclusion.
Like you I also had worries after my second session as I could still clearly make out the scars.I didn’t realise it at the time but what made them look worse was because I had let my hair grow at the back for a good few days thinking this would help to cover the scars better.This,in hindsight, was a mistake as it made them look far worse.Try shaving at least every other day and, hopefully,this should make the scars look less obvious!