Long story short, I have a set of pistons that would not work for my block(ring groove to shallow) I bought another set off the web and the problem is they are 17 grams heavier. The rotator was balanced with the other lighter pistons. Question is can I just mill off the 17 grams? They have plenty of dome, or should I take and have the assy re-bananced? Or is 17grams enough to worry about? BBC 555ci 7500rpm max.