Does grip size really matter?

Today I went to local golf warehouse to try some drivers. I think it is time to change my driver since my swing got better and driver shoot little bit high in the air (I play in golf course where there is always winds).

r11 tp 9*, rbz 9.5*, r11s 9*, razr fit 9.5*, 910d2 9.5* with all 3 stock shafts, titleist 910d3 9.5* 65gram shaft, and burner superfast tp 10.5*(my current one). All in s-flex.

The computer showed ball flight and total distance.

All of the clubs' result were about the same (avg 265 yd total) except titleist and r11 tp 9*. I totally hated titleist drivers all combinations. I think it was because they felt too shorter than my current driver superfast tp. I couldn't set up comfortable. Changed to r11 tp and boom! I was averaging 285 yd dead straight with little bit of draw on 10 shots. I couldn't believe it. I was always averaging 265 ish on my golf course and other clubs I tried shoot all over the place. I sometimes hit 280s but thats when I have to really work hard. One thing that is particularly different about r11 tp was grip size and lie angle. Grip was big. I really liked the feel of it. Lie angle was upright I believe. Do you think the grip or lie angle had the effect or is it the r11 tp technology.

Btw, I was not wearing gloves. I play my irons about 1.5 degree upright.

What is the best loft for me? launch angle and spin rate? I think spin rate for r11 tp was around 3700 rpm lauch about 11* could not see it as the chart quickly disappeared.

Please help me! I really love golf and want to get better.

My swing speed-around 100mph

handicap-15

experience-1year

gender-male

From what I have been told, unless you have huge meat hooks or tiny hands, grip size is mostly about feel and preference. I use oversize grips on all of my clubs, but I do have huge hands.

What size glove do you normally wear?  I have small hands and use a small size glove.  I have undersized grips because it is easier to close the clubface when I swing.  If I use standard grips, I tend to leave the face open and end up slicing or blocking it right (R handed).

Lamkin oversize here - love 'em

I recently had Golf Price Tour Wrap midsize grips put on a couple of my irons, just to try.  So far, I like them and will do the rest of the clubs soon.  I don't seem to grip the clubs as tightly with the slightly larger grips.

Grips can make a difference because they help you control the clubface better.  If your hands are too big for the grips you wont be able to grip them as securely.

i got too handsy with my clubs with standard grips (i wear an xl/xxl glove) and midsized help me get that firm, yet relaxed grip. i use the multicompound GP on my driver and tour velvet midsize on everything else.