4age 20v - Low kpa wot

Hello guys i have my 4age 20v st reading low values at wot

baro/map key on: 100Kpa

Rpm/air filter KPA/plenum removed KPA 3000/93/90 4000/90/85 5000/86/83 6000/84/83 7000/90/90 8000/92/94 ——————— Today i had some test runes with and without to compare them all were done with same baro reading. I guess plenum removed read more because its like short ram theory and long one have more torque down low. But i wanna know why i can’t achieve the 100 or 98. Man im itb this should be free as ****. Exhaust setup is 4-2-1 42prim,50sec,60mm Ehxaust. Running speeduino on tunerstudio