Definitely not blaming the oil, but in automotive when you run higher viscosity oil it slightly bumps your oil pressure up because it has resistance in flow through the various orifices and lube passages. This could prolong the life of a journal type bearing since it has a properly formed oil "wedge" between the surfaces. I'm curious if the bad Rods are bad because of the clearances and/or the material/bushing is to soft
That is inaccurate. In the lubrication of plain bearing surfaces, or rolling element bearings, for that matter, the volume of oil flowing through the bearing is a more important consideration than the pressure at which it is pumped (which actually does nothing at all to improve lubrication). The simple fact that the oil pressure may be seen to rise with a heavier oil is a clear indication that the delivery of adequate volume is being impeded in fact. It's different if you changed to a high volume pump and saw the pressure go up due to pushing more oil through the same circuit over the same time, but when you use a thicker oil in the same system and see a rise in pressure, it's a bad sign in reality.
What carries the load is the film of oil that exists between the two surfaces, and increasing viscosity does not have a direct connection to the relative strength of that film in and of itself. The best way to maintain the film is to maintain a steady flow of oil through the bearing area. Chevrolet Racing found years ago that Chevy V8's were better lubed by 30 weight oil than by 40, even in racing conditions, and in fact, that 50 weight oils were actually likely to cause failures.