Weighing Team Rocket Booster Packs

Hey all!

Iver heard that weighing WOTC booster backs is the best way to figure a better chance of a holo in a pack. Im planning on opening a 1st edition rocket box soon and I’d like to open the heavy packs and grade the light packs. Does anyone have any experience with this?

I’ve heard this is one of the hardest sets to weigh.

Also is it always 12 Holos per box? Can you get more? Can you get less?

Any information would be most helpful!! Thanks!!