The IFA Ivo medium three blade should be what your looking for.
I have been using this on my 912 uls for around 300 hrs. I had a sensenich ground adjustable ez pitch on it before, I couldn't go back to a fixed or ground adjustable now !
I have the limiters set as to get the full 5800 on takeoff , and then usually set it for 5200 - 5400 cruise.
Todays flight -8C , climb 1200 fpm, cruise 5250 rpm, 108 IAS with wheel skis on , 70 lbs luggage , full fuel and 230 pilot .
On a model 4 with the 912 uls you should get some real nice performance.
I'm sure others with that exact setup will chime in.