Yea, I'm not sure how to go about that. That is indeed a tough situation. The manga shows us...
Base Gotenks >> Super Saiyan Kids > Piccolo
But numerically, it makes it very difficult. I'm trying to keep Goku within range of Gotenks. I'm trying to keep a 10x gap or so. Which is impossible if you have Base Gotenks > Super Saiyan Kids...
Basically, the multipliers for Super Saiyan 2 and Super Saiyan 3 determine how strong Base Gotenks is supposed to be. The Super Saiyan Kids are somewhere around the adults power and then Super Saiyan Gotenks is around Super Saiyan 3 Goku's power. So it's quite easy to see what the Super Saiyan 2/3 boosts should be, based on Gotenks.
But when the 2/3 multipliers get crazy, it makes Gotenks a god compared to Goku. I guess there is no choice, I will have to go with the manga here, huh?
Base Gotenks Post > Super Saiyan Gotenks Pre, is nonsense, but Base Gotenks Pre > Super Saiyan Kids is legit. Damn...