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Toro 20332 starts cold, hard to start hot.

I recently purchased a Toro 20332, 2012 model, 7.25 190cc. It has an automatic choke.

It seems to start much better when cold. It starts and runs VERY GOOD. When I try to start again quickly, won't start.

I notice that there is some oil seeping out of the dipstick o ring. I am replacing that. Could this be the problem?
Thanks for any help.
Ed

https://www.toro.com/en/parts/partdetails/?id=37379

click on manuals, post engine make & all numbers from engine