^^^ I'm definitely in the 'shouldn't' for meth. As someone who loves IV rushes, the one time I did meth I wound up shooting it every 45 minutes and really fucking myself up. Had the good sense to stay away from it after that.
Anyway, the absolute top end of physical pleasure is the IV speedball... I chuckled at the OP's description of it along with that he merely snorted it, which is still like the difference between a handjob from a homeless crackhead vs. sex with a pornstar. A few times I was shooting speedballs while on MDMA... there's just no way to describe how good it feels. Also wildly addictive, it's how I destroyed every last vein in my arms and feet. Try to limit the speedballing to once a year now and just stick to plain opiates.