Been listening to OP and examples given and think this is to be fixed as close to source as possible.
You cannot EQ fix this, kind of. It's distortion as already said in thread.
Set velocity curve on keyboard to hard, so you have to punch quite hard to reach velocities above 80.
There is no way to get that piercing hard tone playing real soft like upper register usually is.
That is just cheap piano samples if so.
I've taken midi played with another keyboard that were sounding real harsch like this, having three layers of samples(timbres) on each key. So lowered velocity so I kept in the first 2 layers for soft notes. So this set was mapped to play one set of samples on velocity 1-40, next 41-80, and last 81-127. Volume is always kept according to velocity, but what timbre makes all the difference.
Here is that sampleset
http://sonimusicae.free.fr/matshelgesso ... ro-en.html
Listen to Eroica beyond halfway through, at least some upper notes sounding better. I would not say it match to sound full grand piano, but I used then for a pop mix. And a good example how timbre layers matter. So not using loudest can work.
So having a player that do GIG-files import it should be decent on first 2 layers. Kontakt does not do it right, they made three layers overlap so you got two sounding layers on same velocity, so forget about that. Some player that do gig files right.
If you cannot get a nice soft tone keeping velocity down - invest in better samples. These sound cheap like the first free one many years ago that was soundfont.
And never expect picking midi files from internet to sound good on any sample collection - they have to match what is was played on. I just found the same problem using same recorded midi to different sample collections.
To get consistent feel on soft touch wheighted action is a must.
Not sure what you are saying here "Than in piano roll I put all velocities at 70, totally straight line and the notes are still jumping all over place in velocities???"
You in daw set velocity but still jumps about?
And the tailes on reverb are silly long, it makes it sound like having damper pedal down all the time almost.