Well, from experience from Maple Story, I usually catch to right process in 2-3 second period when game is loading in transition from GG upload & black screen..
Switch to Windowed mode 1st. then try to attach to right process while game is booting, be quick..
And regarding search of memory.
It is not necessary that value in game is 24 or 8 value..
Some games use different approach
P.ATAK = patak *1231/PI or
P.ATAK = (patak *192) +10
so when you search memory start with unknown initial Value, and when it changes switch to search of changed Value.....
P.S.
In Epic3 I had made mem address change with which I could equip lvl 60 heat shot on bow fighter hotkey

that was 1hit kill

but problem was with skills that it took all MP from character for real..
I never hacked Rappelz after that...
never got chance to do it, I had enjoyed game too much to hack it.