Replying to Dynafit radical ST DIN

Hello,
I need another advice, this time about DIN settings on radical ST bindings.
So, I've got myself K2 Waybacks88 181cm with dynafit radical ST bindings. My shoes are Scarpa maestrale GT with 314 sole, im 183cm/6" tall, weigh around 84kg/185lbs and am novice to intermediate rider. The bindings was fited by online shop, where I bought them, but i did have to adjust them to make that heel to binding gap at about 5,5mm (thats still the right rule? is better to have them closer to 5mm or 6mm?). Now I don't know how is with DIN setting. I've set them at 6 DIN atm (looked at DIN charts and calculators) and will probably take a srewdriver with me when I go out to adjust if needed.

Any help well apreciated.