Tuning airforce texan 50 cal hammer spring help

Am pretty new to airguns still but im trying lol. I have a 4500 psi bottle upgrade and a tx2 valve on my rig. Im not going to push 4500 lol more like 3600/3800 max at this point. What hammer spring should i use ? Ive tried to reach out to airforce but they dont reply much at all. Is the hammer spring the same as the 3000 psi version to the 3600 tx2 valve version? .ive been told they have the same spring and valve except the bottle is the only difference. Id like to avoid valve lock issues ! And dont know if theres a more efficient spring upgrade to go with. Seems mixed results with spring mods. Thanks for any help! 
 
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Yes, I use the TX2 valve, hammer and springthat was issued with the texan. I purchased a 4500psi CF bottle but only fill to 3500psi. I turn my adjustment almost all the way to the right (towards valve, trigger). I shoot 250gn Griffin Slugs with a Maddog stock. I do not get valve lock at all, I push those 250s 1000fps for 3 shots (6 total). It is extremely accurate up to 100yds. I'm not a rocket scientist but a happy hunter with this gun.
 
I also purchased a 457.3 chucking reamer and very very carefully cut my barrel chamber in 1/2" deeper so the slug seats all the way into the barrel (1/8" inside). I softly hit the lands with a Dremel stone twisting by hand. The slugs were laying two thirds out in the loading tray. Now I seat them into the lands and grooves by pushing with a seating tool or finger. I have been trying to send pics but it's got an error in their system. Check later and maybe I can get the pictures to load.