Paul Tomblin wrote:
I'll have to get back to you on that - I mostly play it by ear. If I'm
cruising at 2200 and 22, I'll leave it at 2200 and pull back the throttle
until I get 120 knots, then at glideslope intercept I'll drop the gear and
maybe re-adjust the throttle to keep at 120 knots and 700 fpm, and then
push the prop control to full forward.

Try this, pull off five inches of MP and see if that will give you about
500 fpm descent while maintaining trim airspeed. Works well for
following the GS.