If you are talking about your 20/15, I find mine also need to be quite wet to start.

20/15's seem to be quite different handling to most of my other radial ported diesels.
They don't give as many clues that they are ready to start.
Tend to be a bit all or nothing, seeming dead then suddenly bursting into life.

They really like to rev but I would not class them as easy handling.