The effects of altitude (i.e, air density) on springer performance are probably much more complicated than any of us appreciate.
As you probably know, air density decreases by (roughly) 3% per 1000' of elevation. So the air filling the chambers of your airguns at 5700' is about 16% "thinner" than mean-sea-level (MSL) air. If springer power were proportional to air density, this would mean that MVs over your chrony would be ~8% lower than the same gun's performance at MSL.
Unfortunately, it ain't that simple. In a springer, air is (mostly) not the source of the energy of the shot. Air is only (mostly) the coupling medium between the spring and piston to the pellet and thus influences only the efficiency of that coupling.
That insurmountable problem I mentioned is this: When you tune a gun in your workshop, you're optimizing the tune not for MSL air density, but for the air density at 5700' where you live. So when the gun is then taken down down to the valley and shot there in "thicker" air, it shouldn't be surprising that MV doesn't rise much - or at all.
In fact, the more surprising thing would be if the MV didn't DROP!
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