With MDA it is slightly more potent than MDMA, and so you would require less. I'd go for a 100mg starter and a 50mg redose at the 1 - 2 hour mark to increase duration and intensity of effects. MDA is definitely much more body load and drug like experience than MDMA, and probably more neurotoxic too. Getting some for this weekend, dropping about 200mg (130mg start, approx 70mg redose). Might add some MDMA to the mix, but would be slightly concerned that it would be too much MD in one session.