I emailed Sensenich about props and received the following response. Since your plane has gone through flight testing with the prop you have, I wouldnt worry too much about it. However; it is probably worth calling Jabiru for their up-to-date opinion of props for the 3300.
Jabiru USA performed the prop testing for our wood props on the Jabiru engines and would be the best source for this type of info. It is my understanding that the W64ZK-51 is the cruise prop for your application and the W64ZK-49 would be the standard prop. The W68ZK56-58 prop model would not be suitable for the Jabiru engine and is more commonly used on Continental and Lycoming engines.
I would love to see your plane and go flying. Let me know when you want to go and hopefully I can work it into my schedule. I work pretty much 9-5 during the week. The best times for me are Tuesday or Wednesday evenings and weekends.
If you would like to see my build, I am in Brighton and usually working on it all weekend (not sure of my schedule this Sunday because it's Mothers Day).
I got your message. Would love to go flying with you when you make it up here. By May I am hoping to be close to moving my plane to a hangar at OZW.
You should consider joining the local EAA chapter. We have a hangar at OZW and meet the first Thursday evening of every month. I am outnumbered by RV builders - it would be great to have a fellow Zodiac owner in the group.
Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.