MDMA isn't really as energetic as many people think; not in the typical sense anyway. It is, but after a certain point that excess energy and uncontrollable body movement tends to just make you want to sit down.
For me it takes exactly 130mg MDMA to 'come up' properly. Anything much more than that just contributes towards entering the mongy, trippy, sitting down stage.
That's completely normal. After a certain point nobody could possibly dance. Of course, that amount is different for everyone. If you want a more energetic high, then use some scales and weigh out a specific, lower amount.