Ok, on the advice of doubledee (ggod advice I may add). I took it back and exchanged it for a new )S 91 pumped. On this one, I broke it in with 2 tanks - it seemed to break in the same as the other one. Now, I have NOT changed the low end at all. I now have 10 tanks through and have found the following:

1) It now idles much better (DUH - to be expected with some breakin).

2) If I just go and start it cold then the needle valve needs to be open at about 1/2 turn from fully closed. This will let it idle and accelerate fine.

3) After one flight I change the needle to be about 3/8 of a turn out and it now runs just fine.

4) I have not been burning through "F" plugs with this engine.

So, I expect that after a few more tanks I'll do some low end tuning but it appears that it wants to run between 1/4 and 1/2 turn (3/8 seems ideal right now) out on the main needle.

I can find ZERO information from OS. For breakin (and indeed for starting) they suggest having the needle out 3 to 3 1/2 turns. And while mine would start like this (as long as the glow ignitor stays on), I need to quickly turn it back in to only 1/2 turn out.