I got some 65 % yield in a small test, the first one, with may be 9 gr (don't have the papers here), using TS proportions (ketone : am acetate, and 0.2 NaBH4 : 1 ketone ), next tests with 25 , 50 or 100 grs with LabTop proportions yielded form 20 to 40 % only. As we are not too much interested in that material, we ave not researched more. Anyway, let mix the acetate with the ketone some hours, better with silica gel, then filter, wash the silica gel and go for rdxn.