I just bought a Sig Sauer, P220 Elite Hunter in Kryptic Camo. I removed the rear adjustable sight and installed a dove tail mounting plate. Then I put the Vortex Venom red dot sight on the mounting plate. Going to sight it in over the weekend. I am planing to take the front dove tail post off and putting a taller front post on. The Vortex Venom has some marks on the rear to give me center position. Approx. how tall of front sight should i get?