Tony88

If your lie angle is too flat, it will make your putt left to right. That maybe the main reason, grip may not so dominant to the path. You can refer to one of the illustration I found on the net. https://www.insidegolf.com.au/golftips/putting/the-effects-of-an-incorrect-lie-angle-on-your-putter/

Mmm, your 1 dot ER1V head+screw+hosel weight 355garms. Can you tell us what's your hosel type? I don't think every type of hosel weight the same.