I can relate to the speedy-effect, at least to some extent:
For I don't know what reason (it could be related to my bipolar condition), stimulants never worked on me, at least I never had the desired effect, i.e. being stimulated by them. The only effect I have, and it's the same whenever I tried stims, is that everything crashes in my head, as if a wall of brick just debuilds himself, brick by brick, my body feels at un-ease, I need to lay down, as if my heart isn't working well (and it goes from tachycardia to very slow beating), and the most important effect is that I feel like deeply in anger, not that I want to destroy everything, but that everything annoys me, and it's pretty ridiculous : "why is this chair put like that?", "why the TV speaker is speaking this way?" "Don't talk to me, your voice is irritating me". At no point any pleasant stimulation !
And it's the same, from a strong dose of coffee to 10mg of MDPV.
For somewhat reason, I have the exact same irritation when on tramadol, yet less severe and counterbalanced by the pleasant/orgasmic mellow effect. (For what is worth, the only med that has a stimulating effect on me is escitalopram, an SSRI, who knows why..)
I have wondered in the past if there could be a link between stims and tramadol, now you are the first person I read who also point it out.
So, as far as I'm concerned, there could be a correlation..