Umarex Notos Budget to Gucci build

Started life as a basic Notos, i wanted to see just how far i could push the platform. The goal is to tune for 22 Fx Hybrid slugs at or around 960fps. I started this project for fun, as when i started into airguns building crosman 2240 2250 etc etc QB co2 rifles all onto pcp rifles. It has been alot of fun and have smiled from beginning to end.

Things ive addeded-
500mm Fx liner system
Buckrail chassis
Huben power regulator drop block
300cc carbon bottle
Sabertactical vertical grip
Magpul prs gen 3 buttstock
C88 machining power plenums
Donnyfl Tanto
Carbon fiber Liner sleeve
Utg tactical quick release rings
Sightron S1 4-12x40 MOA 20 scope

I opened up the valve seat and block transferports all to 4mm, along with the plenum transferport. Plenum transferport port is the issue, needs to be larger then 4mm but tricky to do. Ordered a new valve poppet made from peek and stainless steel. Im looking to swap out the valve return spring for something just a bit lighter as to open the valve at higher reg pressures. So far ive been able to pull 35 foot pounds. But i need to pull at least 10 more for the end goal.

Rifle will be used as a small game hunter.

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Its 100% about air.

1.) How long the air is acting upon the base of the pellet
2.) How much pressure is pushing against the base of the pellet

Barrel length (to a point) increases speed as does more available air (plenum) and wider path (porting). Everybody loves to port out the air block but this is only 1 of the 4 restrictions, one also needs to port the valve, the transfer port and the barrel.
 
Its 100% about air.

1.) How long the air is acting upon the base of the pellet
2.) How much pressure is pushing against the base of the pellet

Barrel length (to a point) increases speed as does more available air (plenum) and wider path (porting). Everybody loves to port out the air block but this is only 1 of the 4 restrictions, one also needs to port the valve, the transfer port and the barrel.
I am fully aware of the basic science behind how modern pcp rifles work. These are all things i have already done. Thanks for the reply