Hmm, i have a TEA II but have never had any trouble with large cooling flushes. What does your steam pressure sit at after the element has cut out? Mine is 1.3bar, slowly goes down to about 1bar then element comes on and back up to 1.3bar. If your pressurestat is taking it up higher than 1.3 bar this may explain the need for large cooling flushes, in which case you could just adjust the pressurestat slightly i would imagine.
What does this restrictor do exactly? Does it restrict flow of water into the group head? Does it affect your shots?
Interested to hear more, thanks.