I found mounting the servo FLAT increased initial turn in. It alters the ackerman angels

Correcting the Bump Steer after mounting the servo flat requires shimming the ball studs on your steering arms.I never found i could get it perfect but you should be able to get it good

If your running indoors on carpet i'd recomend the flat servo

Oh and if you've cut off the alternate mounting ears from the servo in the past I'd guess your going to be using tape and glue to fix it. I can't see any way of using posts thats going to work correctly, well not while keeping the servo far enough forward anyway