I just switched from 4U 88s to 3U Aeronaut 8000D. Before I used Nanoray 900 and Zspeed which was 3u without any pain. I strung my racket at 26/28 aerobite boost which I been using for a while without no problem. My technique is correct and everything but since I played with 8000D last week. I feel a little bit pain in my ring fingers , pinky fingers , and run down thru my forearm. Every time when I try to grip or grap something. I feel uncomfortable. I ve noticed that the Li ning racket has a smaller grip size and I usually use thin grip as thin as I could get to get the advantage of finger powers. Have anyone knows the solution for this? Im thinking about restring 8000D with smaller string with lower tension (25ish) , but I really like the feeling of this string. Would increasing the grip size alone get rid of my pain?