First thing I'll remark is that pure MDMA is not very stimulating or energizing per se, I find it to be a bit sedating even. A lot of times when MDMA gives you a real uncontrollable urge to dance and you can dance for 8 hours straight if need be, it's adulterated with something else stimulating (caffeine is found a lot, as are other amphetamines). On pure MDMA it is fun to dance, but you could just as well spend a night without moving from your spot on the couch without even thinking about doing something energetic once. I even spent entire parties on MDMA at the sidelines sitting down and talking, without dancing
I find that with very clean MDMA, which those bitcoins certainly contain if they're from the android/PF/MK pressers, the euphoria can be very... subtle isn't the word I'm looking for but close. You feel very clear until you focus on the underlying feeling and realize you're actually rushing in all directions, but the empathy kind of keeps the euphoria contained because the empathy is a more profound feeling and you focus more on that. That is until you dose very high at which point the euphoria can step into the foreground. I don't know if that makes any sense at all as it makes little sense to me while re-reading this but I can't explain it in another way (pretty stoned right now

) and this explanation can be completely wrong. In my opinion lower dose rolls tend to favor empathy more and have euphoria more in the background, higher dose rolls tend to favor euphoria more and have empathy more in the background. The first one is known as the real ecstasy feeling (or at least that's what I consider the true ecstasy feeling, it's all about the empathy, the underlying euphoria is a nice add-on). Don't take me saying "higher doses tend to favor euphoria" as a pointer to start dosing very high by the way.
It also depends on how much you took as your initial dose. As the initial dose is going to determine mostly how hard you're going to roll and re-doses mostly extend the role while not amplifying it much. For example if you were to drop 100mg as initial dose and 50mg more 1,5h later you would not feel a 150mg roll, you would feel a 100mg roll that lasts longer. How much did you take as your initial dose and how much did you re-dose and when? Personally I need very high initial doses to reach the full effects
Also you said you "were unmedicated for them", the aspergers and the ADHD I assume you mean, but are you on any other medication? Especially anti-depressants or any other substances that interact with neurotransmitters are of interest
Welcome to BlueLight!
*edit* By the way as Trozzle already hinted at, rolling 5 times in 2 months is not advised, you will build up tolerance and that's when the empathy will start to disappear from your rolls.