Training my characters

So lately i've been playing in 3-4 diffrent characters: lvl 77 Mercedes, lvl 81 Kenna, Lvl 123 Hayato and lvl 143 Phantom.
I've wondered where i the best place to trian them to be in higher lvl in such sort of time...

Some good places could be Monster Park, PQs, and especially Evolving World Link 3.

I've been training my late 6x Kanna in the cooking panda PQ solo. If 90ish percent every 20ish minutes is decent, then that PQ is pretty good. I really don't know what is a decent leveling rate throughout the 70+ level range nowadays though.

Bad thing is, the PQ is pretty boring. Good thing is, you can get a hat + overall set which is pretty decent if you don't have equipment prepared for the class. And they are fairly easy to obtain.