You have a nice pistol in the Sig 226. Rather than spend the money for another pistol in .22 it may be better to get some professional instruction. If your techniques are faulty then no amount of practice will make you better. One or two day classes can usually be had for much less than the price of a new pistol. Classes are usually offered all over the US by various organizations and individuals. Good luck and stick with it.
best wishes- oldandslow