Lyde: In the C1 variation instead of J4 also L13 works. And I don't understand why the timing for E13 is so specific, there is actually not even a need to play it because if the opponent plays there you can cut at B12.
In the H12 variation instead of H9 it can be good to exchange J13. For example at the end you can play J13 and L13 to make an extra point instead of A6
Sadaharu: Added some variations. L13 instead of J4 doesn't work because if white gets J4 and cuts at K6 the bottom black needs another move.
Added some variations. L13 instead of J4 doesn't work because if white gets J4 and cuts at K6 the bottom black needs another move.