I have Keratosis Pilaris Rubra. Why would a reduction in redness only last for a week after V Beam?

I read Vbeam stacking at lower settings is as good as bruising settings for diffuse redness. Can I have lower settings/stacked pulses and achieve similar results as bruising settings? My KPR is diffuse redness without keratin papules/flushing. I had 5 Sciton BBL treatments with no improvement and 1 Vbeam Perfecta at 8.5 J/cm2 / 6ms. Post Vbeam I had a reduction in redness for 6 days. I am now back to normal without much improvement. Why would there be a reduction in redness for only one week?