Air Arms More power for my Air Arms MkIII?

I have the vortex spring kit in my Mark 3 and I'm getting about 660-ish feet per second with 16gr pellets... is there anybody else that offers a kit that can get me up around 800 + ft per second? Anybody out there with any tips or tricks or I can up the foot pounds in this baby?

800fps with 16gr pellets is over 22fpe! A TX will not make that, if you want 22fpe from an AA find a Pro Elite. No kit will produce near that power from a TX.
 
800fps with 16gr pellets is over 22fpe! A TX will not make that, if you want 22fpe from an AA find a Pro Elite. No kit will produce near that power from a TX.
A Pro Elite will barely do 18 , but when doing it,it’s a harsh gun

get a HW 80 and be happy at 15 to 17 ft lbs. very few 20 ft lb guns shoot great … I did not say accurate but they all are trepidly harsh from 16 on up.. I’ve got a few I’ve made well into the 30ft plus lb range and rarely shoot them.
 
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A Pro Elite will barely do 18 , but when doing it,it’s a harsh gun

get a HW 80 and be happy at 15 to 17 ft lbs. very few 20 ft lb guns shoot great … I did not say accurate but they all are trepidly harsh from 16 on up.. I’ve got a few I’ve made well into the 30ft plus lb range and rarely shoot them.

I've owned at least three .22 PE's and one .177 and ALL of them make barely less or a fair bit above 20+fpe. (.177 @1025 w/8.4gr= 19.6+fpe)
 
I have the vortex spring kit in my Mark 3 and I'm getting about 660-ish feet per second with 16gr pellets... is there anybody else that offers a kit that can get me up around 800 + ft per second? Anybody out there with any tips or tricks or I can up the foot pounds in this baby?
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