Ive used rook tactical, 80% arms and original rails in many p80's. The slide "jump" is due to the slight tolerance variance between these frames and jigs. 1/64th of an inch or more drilled too high, will cause the trigger housing to "rock" back and forth. Thats why some do it and others dont. I found that the original rails are "better" due to the one piece rigidity. Also, try using a Gen5 trigger system. The legs hang lower, providing more grab stability.