less rich, less power?

[Brandon Rogers]

Hey guys-
my car had been runing rich for a while so this past weekend I swapped the Thermo Switch on the back of the head, and also replaced the injector seals due to some evidence of blow by or leaks or whatever where 2 of the injectors insert into the IM.  The car seems to be running less rich, judging by the exhaust smell, but the car also seems to be a little less powerful, seat of the pants.  Does this make sense?  I was thinking (hoping) that it would feel even better with a more "proper" mixture.  I admit, maybe less power is due to warmer temps???  It is now in ~60F whereas it's been 30s 40's up til recently, but 60 isn't _hot_.  This is an urq 20V, so my IC is smaller than what is stock on a 200.  

Thanks-

Brandon
'84 urq 20V