Well, speed alone is not my goal but I consider it "healthy" for a boat to be capable of at least 40 knots.
The boat ,having a "mediterrannean" configuration, that is,aft sunbeds with lockers underneath,full length sunbed covered engine room,big capacity tanks etc, is certainly on the heavy side specially when in the water for long periods in the summer, with every available space full of lugagge,tents,and a big deck fridge!
I am not sure of the exact weight when in "expedition" load.
But its pretty much always like this!!
Your advice with the small prop sounds good I will definately give it a try.