Its possible that your system is just not able to keep the temps down to 160... so when the temps reach 160, the T-stat just stays open... when that happens coolant does not stay in the radiator long enough to drop down to that 160 T-stat .... so you basically have a run away cooling system.
I would try a 180T-stat and see if that doesn't keep the temps down.
In the end, you need to stop the flow of coolant long enough for the radiator to do its job. That 160Tstat is like having no t-stat at all.
Another great mod you may want to try is turing your aluminum single pass radiator into a tri-pass radiator... those are known to drop temps 15-20 degrees...
SPEED SAFE, NICK
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