Perfect transformation is when you have enough PL that when you transform, it's instant.
For the Dragon Balls, use your scouter to find them. (Remember to turn on CTDB mode first)
Sensu beans are very hard to find. (It's a bug, the sensu beans are below the map) You can find sensu beans at the end of the lake in esf_riverside, you should be able to see them peeking out just a bit.
Hope this helps.