The air should not be circulating around the shroud. It should all "draw thru" the radiator, from the front grill towards the engine. You do not "push" air thru the radiator, you "suck" it thru.
I have a beer on the fact the new 'stat will not solve this prob. If it does anything, it will be problematic to cold weather driving. The fact that the engine temp is running high should be clue to the fact that it is an efficiency cooling issue.
If it were my truck, I would re-wire the fans to "draw thru" the radiator and use a 170 degree stat.
[OPINION] 160 degree is to low. It will cause ECM issues at the lower running temps. A low temp stat (160)is good for keeping fluids/engine cool while in the stage lanes of the drag strip. Once the engine is in full warm up, the engine never sees 160 degrees again.[/OPINION]
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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