having just gone through the sim from hell sessions
20" at 2400 rpm will give you 120 kts on the ils gear down at the FAF, no flaps.
26" at 2400 rpm will give you 120kts on a np gear down between step down fixes, no flaps, with 12" for the np descent, make sure you get the power back to 26" while you are pitching.
30" at 2300 rpm gives you cruise of about 160kts
if you like, 24" at 2200 rpm gives you 140kts, for cruise, which is what I'd recommend for the short legs.
Have fun.. good luck.
sb