I've noticed on that gold nugget map (3126-9885-4862) for XP farming, if you have the plasma gun from a prior playthrough you can shoot a very specific spot on this clicker-dollar thing and get significantly more XP. It seems like the plasma ball hits one of the vaults beneath the floor it's not meant to, building up all three resources simultaneously. If you shoot it higher than this you don't get tons of XP nor any of the resources, so that's my assumption of what's going on. This is like the second clicker you unlock, so if you keep the plasma gun from a prior playthrough then you can get a lot of XP and reach the third floor nuggie way faster.

https://files.catbox.moe/rtnlhu.mp4