How do you pronounce it?

Personally, I think it actually should be pronounced just like the kana way of spelling them. However, I don't always follow my own belief.

My ways:

Fira - FEE-rah
Firaga - fee-RAH-guh
Firaja - fee-RAH-juh

Blizzara - blih-ZAH-ruh
Blizzaga - blih-ZAH-guh
Blizzaja - blih-ZAH-juh

Thundara - thun-DAH-ruh
Thundaga - thun-DAH-guh
Thundaja - thun-DAH-juh

Cura - kyur-AH
Curaga - kyur-AH-guh
Curaja - kyur-AH-juh

And then there're funky ones like: Hastega - I seem to alternate between HAYST-guh and ah-STAY-guh.

Are there any provable pronunciations? How do you pronounce them?