Still running hot after Weller kit.

Any ideas? So there is this long hard hill up in the smith valley, Nevada area we always run up. When it’s 90 degrees or hotter my rzr would limp 2 times up the hill. I bought a Weller Oil kit and ran up it again today. I made it all the way up, but at the top I still saw 228 degrees. Am I just expecting too much out of this oil kit or do I have another problem I’m overlooking?
Here is what my rzr looks like. I know I’ve added weight and bigger tires, but I would think it should not have made such a drastic difference.



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