Fraxel Restore Session for Acne Lasted Only 6 Minutes

I'm a 52 year old Caucasian man who cancelled a second Fraxel-Restore session today for acne scars on my cheeks after reading about worrying side effects by patients: 'orange peel' affect, 'pin holes', and 'fat loss', accompanied by some disturbing pictures. However, I’ve noticed that the doctors on this site discount these side effects as coming from Fraxel. My Fraxel practitioner is a highly qualified and experienced dermatologist, and I'm now wondering if I'm worrying unduly. My dermatologist admitted that there was little or no effect from my first session – in spite of having a high Fraxel Restore setting of 60 millijoules power, treatment level 6, and 1550 nanometeter setting with 8 passes – and has kindly offered me a full refund. One thing that concerned me is that my session lasted only 6 minutes. I quizzed my dermatologist on this. He thought it was 15 minutes (it wasn't as I timed it), but said it wasn't the time but the number of passes that mattered. Is it possible to effectively cover my whole face with 8 passes in just 6 minutes? The Fraxel website suggests 15-25 mins. From my pics you will see that I have moderate acne scars with my biggest issue being a large acne depression on my cheek. Is Fraxel Restore itself likely to be effective here, or will I need supplementary work such as subcision or possibly a stronger laser such as Fraxel Repair? Finally, I would be very grateful for recommendations for the best Fraxel practitioner in London or the UK.