Hi Chris,
Transformer temperature sounds pretty good to me. Anything lower than 'ouch'
hot is a good result!! I have even mounted small cooling fans to blow air over particularly hot running LOPT's in the past: makes a big difference.
I bought myself an infra red 'point and shoot' type thermometer from Ebay for about £8. It's great for measuring LOPT temperature and I think it will even do Fahrenheit
It's good to see you're interested in finding out more about how TV's work. Only problem is, the more you find out, the more you realise you didn't know!!
Cheers
Nick