Going off what Mikeey was saying, I've had a very similar experience. I've never plugged or IV'd meth, but I found the effects to vary very noticeably depending on whether you eat/snort/smoke. Loosely speaker, the "weaker" the ROA (ie. slower effect/lower bioavailability), the more it seems to provide a "body high" feeling and a speedy stimulation, while the "stronger" the ROA, the more it tends toward a headrush type high, more fiendish and euphoric but with less of the "get up and go" effect.
Eating would give a strong, driving body buzz, while smoking was mostly the euphoric headrush feeling but with no physical urge to get up and move (in fact it often made me almost lazy - lounging around just smoking pipes without actually doing anything). Snorting was a good compromise, euphoric but also energetic, which made it my favorite ROA back in my early rave days (also convenient in venues).