Cold Oil Temps Seneca II

We are having a problem that I'm sure not too many others are: both of our engines are running very very cool oil temperatures.

With an OAT of 40 F, both engines are around 260 - 300 F CHT, TIT is around 1550 F and both engine oil temperatures aren't getting much hotter than 120 F (yes cowling flaps are closed)!!! We are now operating lean of peak with Turbo GamiJectors, but have had the same issues before we switched. We've been troubleshooting this all fall and have had cooler oil temperatures year round.

Both vernotherms (oil temperature controllers) have been confirmed to be working properly. Winterization kit is installed (1/3 of oil cooler blocked with plate). Cowl flaps are closing all the way, baffles and seals are all in descent shape. We have even tried blocking the louvers on the top of the cowling and blocking around 80% of the oil cooler and haven't had any significant gains. Both engines are running the same and producing about the same temps.

Does anyone out there have any insight to this? We had one engine split this summer for another reason and the shop found lots of corrosion, which is a result of the oil temps not getting hot enough to burn off the moisture.
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