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Winston,
The question of whether or not you have to change your dot from 11 to 25 yards (or between any other two distances) is largely a function of which ammo you're using.
I presume you're using a high velocity ammo since the P22 won't reliably run on regular/standard velocity ammo. There's software out there that can calculate the rise/fall for a given "zero" adjustment, but the real answer is on your target; if your groups move between the two distances then you need to move your sights or dot.
BTW, having to use high velocity ammo is a real bummer in bulls eye shooting - it just makes coming back on target that much harder in timed and rapid fire. You might be able to find a gunsmith that can tune your gun to run reliably on standard velocity ammo, and if you continue in BE shooting with your P22 as your pistol of choice, it might be well worth while to seek him or her out.
Al the best,
Rob
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