Ok so I have a jar of everclear that has been sitting with 20g caapi leaf for a month and instead of evaping back onto 2g leaf I was thinking of just keeping it as liquid. Seeing as how I use everclear to dissolve the dmt then evap onto herbs I would just use this mixture to dissolve it with then evap onto herbs for the MAOI effect.

The only problem is knowing how much to use. Not only for potency but I'm sure after the liquid is evaped there will be a weight increase.

Has anyone used this method before or have any tips for best results?

Yes, I used this method a lot.
Instead of evapping your caapi menstruum onto caapi leaves, you use the menstruum to dissolve spice and evap the harmalas plus spic eon mullein for example.
Of course it works and I do'nt find caapi leaves ot be that practicle a carrier for changa then mullein.
Now I switched for some time to harmalas FB from rue extraction, so I simply dissolve 200mg harmalas FB and 1000mg n,n-DMT in IPA or ethanol onto 1200mg mix of medecinal herbs (mostly mullein and a few aromatic for the taste, mint, white sage I.E).