2002 Buick Lesabre Rough Run on Restart when warm

Hello, I have a 02 Lesabre with 160k.  Runs pretty well overall, good mileage
and i've completed a decent amount of repairs in the last 20k miles (intake
manifold and both gaskets, IAC sensor, crank sensor, o2 sensors, plugs &
wires, MAF sensor, coils and ignition module when it wouldn't run).  The only
issue i have now is restarting the car after its ran at temperature.  It starts
and runs fine when cold, but on restart when warm it idles rough for the first
20-40 seconds, or clears up after I increase the RPMS for a short period of
time.  After that, the car runs just fine until the next warm restart.  

I have checked the regulator to see if that's the issue and have checked for
vacuum leaks.  No apparent problems with those;  i am guessing some
sensor or part gets heat soaked when the car runs and then has problems
on hot restarts.  I also checked the fuel pressure and see about 145 psi
when running and 150-152 psi on initial ignition; the injectors are all getting
the correct voltage and are very close in resistance to each other.  I think it
could possibly be a leaky injector that just leaks ever so slightly when its hot
after turning off; there is a fuel smell when it is running rough on a hot restart.  
Only code i get intermittently is the p0440 for the evap canister/gas cap, it
just doesn't seal well when cold; does not coincide with the restart issue it
seems.  I do notice the fuel trims increasing when its gets warmer to 14-16%
after driving for 20 plus minutes, but it does not change the performance or
idle.  The problem is noticeably worse on hot days when restarting.  Any
ideas on what my issue may be?  Tired of replacing parts on this commuter.

Thanks