32's generally rub on the X model. It will change the shift points and may not shift into 6th (depending on the true tire diameter and weight of the tires). You will not "need" to reprogram the ECU shift points but it is recommended. Try without reprogramming and see how it goes.
Only way to calibrate the speedo is with a SpeedoDRD (or similar device)...
There is nothing you can do with a programmer to regain the power loss. At sea level, you "might" gain 4 hp and above 3000 feet there is nothing to gain so don't waste your money unless you are getting one to fix the shift points. You will need to do something mechanical to make up for the tire size difference such as IGR, Engine work, Turbo, etc to get any noticeable power gains on the Talon.
