1L flask is ok, too little lye, do not measure pH in the initial stage - useless
My procedure :
Put 50g NaOH into 0,25L of distilled water.
Add 50g of powderized MHRB
Mix thoroughly, the more, the better
Let sit for 24 hours. Mix every few hours
Add 0,5L of distilled water, mix thoroughly
Add non-polar and do 3(for toluene) pulls. For heptane much more
I am shaking for full-speed for 1 minute and then let fully settle the layers. Then I shake again and let settle. I repeat this 3 times for the first pull, 6 times for second pull and 10 times for last one. I am using toluene though.
Heptane is not ideal in that stage, if your aim is good yield. It gives cleaner dmt, but you have to do mure pulls to get dmt out of the soup. If you don't mind doing 7-10 pulls, then it can be used.
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