Hi, welcome to the Nexus!
Acacia confusa can be pretty variable in alkaloid content so it is generally recommended to start low to get a good feel for the particular batch of bark before upping the dosage too drastically. With Mimosa, people generally start at about 3g bark along with about 3.5g Syrian rue (tea or some just eat the seeds. I prefer tea or harmala extract as they have been more effective for me).
I don't have very much experience at all with b. caapi so I can't really recommend any dosing there. I found rue to be reliable so never played with b. caapi much. But, for acacia confusa, a good starting point would be somewhere between 3-5g. If that ends up being too weak, I'd up it by 1 or 2 grams each time until you find your sweet spot.
However, it can be a tricky beast getting all the timing correct with MAOI/RIMA inhibition. I'd say it is more important to get that right first before upping dosages of DMT. Proper inhibition will require much less DMT to get the job done. Then there is the whole argument of taking them separately or together. For me personally, I found that ingesting the MAOI/RIMA first, followed by the DMT no more than ~10 minutes later has yielded good results.
Anyway, hopefully some of this is useful to you! Have a nice day!
TGO
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