brushless 1/5 4wd conversion about to begin! couple questions.

[Ryu James]

so i ran for about 10 minutes today with the same 15/40 gearing. temp is 75* outside. motor was 88* and esc was 120*. i was just running on asphalt and running at moderate speed. what do y'all think about the gearing and temps? i worry the esc is gonna get too hot when i actually run it in dirt and have the body and everything on but 120* isnt bad. just wondering if i should gear it a bit lower.