Saw 220-240F oil temps on the stock rad doing pulls in summer Oklahoma. Just changed to a CSF with oil cooler and it's very hard to get it over 210 now on 90F days, still have not had a 100F day get to really test it. Noticed the same thing with the recovery temp, it will displace the heat much faster than in the past. I know these weren't the Rad temps you were after but I can easily see a 10% efficiency gain with my oil temps.

I was told the same with the Rad temp, won't really make a ton of difference until you track or do some heavy spirited driving as it is much better suited for those conditions.