The fact that the angles _should_ be sorted is quite easy to realize from considering how Kaczmarz' method works (again, chap 7 og Kak & Slaney explains this well). However, I have no reference on exactly _how_ it should be done. The method here was the conceptually easiest I could think of, and hence the first I tried. It worked very well, and as hinted in the comments, the choice of parameters make no significant difference. However, it is essential for good results that the angles are ordered. If the angles are sorted in increasing order, one can tell by inspection that results are worse that what they are with the implementation here.

A side note: If anyone has ideas for better ways of ordering the angles to minimize correlations, I'm listening! This method scales as O(n^2), n being the number of projections. However, I'm guessing I might get away with this as the number of projections is usually not that large anyway, and the asymptotic scaling of the rest of the method is also about O(n^2).