Hello listers, I need a little advice on an oil cooling problem that I have.  I have discussed this on the list previously and am now fed up and ready to do something about it.  I own a Glasair I that I did not build, and I am extremely happy with the aircraft except for this cooling issue that the previous owner did not tell me about (I'm sure he forgot...yeah, right).  My oil temps are always around the 220 range, and on hot days on a climbout and sometimes after leveling off, I have seen temps around 240 (and I go ahead and get on the ground),  This issue has limited me to not flying during the summer.
During the last annual (November), I had the vernatherm replaced and this did nothing.  My oil cooler setup looks like most others I have seen, with the cooling "hole" on the back of the baffling on the pilot's side, going through the orange tubing to the shroud on the cooler which is mounted on the firewall.  I have some "shark vents" on that side of the cowl presumably to let this cooling air flow as it should.
My question is this:  I have heard of some people on the list switching from a 7 vane to a 13 vane cooler and this solved their problem.  Do you think it would be best for me to try this first?  Or should I go ahead and put a dedicated naca vent on the bottom of the cowl and dedicate a cooling hose to the cooler?  Or will this potentially cool too much? I really don't want to do this, because I'll have to cut up the cowl and repaint, etc.  Any suggestions would be helpful.  My cylinder temps are fine (around 350).

Steve Reeves
Glasair 1  N343ND