I have been to Nashmooo in the past, in the very distant past, but I had figured I'd wait a bit until I'd go there for actual skillupses.

I figured Bluetail should have been rather good from 45 up at least a few levels. They bite all the time over at the west-coast of Qufim, and from those it would be natural to go for Bhefhel Marlin at least until the slices of bluetail are plentiful. I tend to go for things that have more than one thing going for them, sort of like multitasking (bluetail for b. marlin for pirate's/brigand's charts).

I had also been thinking that it might not be the best idea to go for fish that is more than 10-20+ levels higher, but it's not like I personally remember getting better rates on a fish closer to my level compared to something that is level 90 or higher.

Either way, Nashmooo is on my list indeed, and I will try to keep better records at least for myself. However, I am confident that I will keep on thinking that the rate at which the skillupses happen is not high enough.

Not even close.