Reactor questions

[Frozenocean]

looking for some feedback/experience on a few questions related to Reactors

I'm running a TLF 150 reactor with a maxijet 1200....packed full of carbon.

My questions are:

Is it better to run less carbon (say half full)?
Is the maxijet 1200 too much for the carbon?

If I wanted to run GFO in another reactor, is it better to run less of a pump...say a MJ600....I understand that you want the GFO to tumble like bio pellets.

Which reminds me....what pump are people running with their biopellets (MJ1200....doesn't seem to be too violent of a tumble)

Thanks!!!