Imps, Pouches, and Secret Recipe reward list

There's a little blue square on all the powerups, indicating which one it'll help. Unless you mean that the powerups you find are random, so you can't keep applying them to a particular imp.

The latter.

And when I fed my imp a helment, it only got 20, unless i wasn't paying attention. It's just easier to do ETCs anyway.

And that sucks about alarm clocks, but i guess it saves you 1 day? Then it'd be best to do either 2 or 3 imps. 2 imps would make closeness easier to get, while 3 imps would mean you have to feed it every 10minutes 100 times.