[Amps] questions on my tranformer test

[kenw2dtc]

Hi,
I'm trying to figure out the current rating of a plate transformer.  This is 
my test setup:

http://w2dtc.com/2005-0610-transformer-test-page.htm

Questions:
1.  Is this a valid way to find the secondary current capability?
2.  Is the internal temperature of 180 degrees F too high for a transformer 
under load for 5 hours?
3.  Is there a problem running this center tapped beast in a full wave 
capacitive input configuration?

Thanks and 73,
Ken W2DTC