I'm still lost. I'll stick with whatever came in my kit. Seems to work fine. I thought i had a good understanding of pistons/oils, but i guess not. What i was always told was thinner oils = less pack, more/bigger holes = less pack, less/smaller holes = more pack, thicker oils, more pack. I have yet to grasp the concept of how 2 pistons with the same surface area, but differ in # holes, can have a different feel. Also, can't you get the desired "pack" by adjusting oils instead of changing out pistons? I understand why you'd change out your pistons if oils starting to get into the high 40's range, but why change them if they have almost identical surface area?