Ways to a better BOZ?

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Even I have left my BOZ unused, I have been very impressed with BOZ sound performance. It was very dificult to build, but once perfected... wonderful. Anyhow, it left me with one problem I couldn't solve: the high frequency.

I 'm wondering why I cannot find a discussion regarding constant current source for the BOZ, as well as higher bias current (than the 40mA). May be a ccs doesn't worth a try, but at least somebody like me is very curious about the result. At least it is easier to build than the balanced line stage one (mechanically).
 
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