Ed:
     Couple things to observe on the pinhole issue.  
     
     1.  At 4.5 ft/min., wetting up through the barrel may not be happening 
     with a 190 topside board temperature.
     
     2.  Another possibility is if you have top side through hole 
     components that are setting flush to the board, the only place to 
     outgas is through the bottom side, hence, a pinhole or void.  If this 
     is the case, you may want to use a slotted spacer on the top side of 
     the component.  If this is the problem, the spacer will fix the 
     problem.
     
     3.  It could be the quality of the barrel itself and you are getting 
     outgassing from the board.  EEEHHH,,, I am not sure about this one ,,, 
     there are some other things that come into play here, like A.  barrel 
     quality, B.  laminate construction,  C.  moisture in the board 
     (however you are baking, but this time of year maybe not baking long 
     enough).
     
     Hope this helps Ed Gaven.
     
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