4-HO-MET is pretty well understood as a simple 5-HT agonist with activity close to psilocin. It is ideal for benzofuran flips because it is a 5-HT1a agonist, is readily available and is fairly gentle.
5-HT1a is thought to be an important part of the magic of MDMA. Most other phenethylamines do not activate 5-HT1a as much as MDMA, if at all. Tryptamines do.
I do not think that 5-MeO-MiPT is a meaningful MAOI in any way. It is possible that it is a mild triple reuptake inhibitor. For this reason, and the reason of its slightly idiosyncratic pharmacology, I would prefer to use more simple psychedelics.
I think 2-FMA is necessary, because it balances the monoamine release for strong SRAs. This allows for a lower dose of 5-MAPB for the same intensity, increasing the ratio of effects to side-effects. I have had MDAI (a highly selective serotonin releaser) with psychedelics before (25I, 2C-B) and generally I did not enjoy it. I found it made the experience darker. For this reason I would aim for a low dose of empathogen with balanced release.
In order of decreasing selectivity (and therefore decreasing ratio of stimulant): MDAI>5-APDB>5-APB>5-MAPB>6-APB>6-MAPB.
I think 2-F(M)A is good because it is a simple stimulant which will balance release without adding other noticeable effects. 2-FA is arguably better than 2-FMA because its shorter duration makes redosing less likely to prevent sleep for ages.
Given the choice, I would choose MDAI as it is to serotonin what 2-FA is to dopamine - generic and simple release. Unfortunately it's not available any more.