You get something, you lose something.
You are getting higher powered shots BUT you get less of them. To shoot the valves that have had the poppet closing spring removed you can't shoot the bottle down as low as before. I fill to 3400 (verified PSI, not the 1" gauge which is 200 PSI off on my gun) and shoot three shots then refill.
Plenty for hunting.
I also can chose to carry a small 4500 bottle to give me one refill in the field.
I've not disassembled one of the new valves but Doug (Dyotat100) found if you pulled the poppet spring out of the valve you got another 50 FPS velocity with the same fill. So only ENOUGH air flow closes the valve during firing. Drop the system pressure too low and the valve stays open during the shot and it dumps. I've had it happen until I learned to keep the pressure above 2000 on my Dyotat100 reworked rifle. I was told that AirForce was leaving the spring out on the new valves to gain that bit of velocity. Yes/No?
No, it's not a perfect system but it's physics. Not a AF spokesman / endorsee but I have some Texans in my Airgun collection because they are a tool that does a job. You have to use a tool within it's limitations. I tell people who complain that AF should have a magazine to figure one out themselves and they would sell a lot of them.... But they DON'T because they can't figure one out either.(because this style of action it would be VERY hard, I sure don't see how. If you make it so different that you COULD use a magazine it would not have the advantages the current bottle/valve/action have)
Same with the valve, want the extra power then there will be limitations on it compaired to the old version. If you can think of a better way, design and build one and prove your's works. It's a 'free' country, if you are smart enough to 'build a better mousetrap', people will buy your idea/product.
I had the AfricanAirOrdance spring in my .457 Texan and it was not fitting well nor working right. Doug changed it out to his spring when he upgraded my rifle and it works perfectly. Maybe he will sell a lot of springs, haha. Great guy and has a lot of experience with the AF platform.
Note also that with an upgraded valve giving more FPE, I lost some flexibility on bullet weights so I'm not surprised to see the new Texan valve being a bit finicky. Physics rules everything.