I think the world of my .68. I think the .68 is the best overall of the MDS engines. But the .78 runs nice too. I also have a .48 and a .58.

Rumble,
My .68 runs about the same as yours. In spite of it being ABC, it took a while for it to finally loosen up. I only ran three tanks on the bench. The rest I did in the air but it didn't like being the least bit lean for a good while. I had to keep it just above 4 cycling for maybe 10 flights.

Jim