ran the numbers. not seeing it.
Low diff or high diff, the numbers don't show an exploitable skew.
for all 186118 blocks, if nonce mod 'power of 2' == 0, increment value below:
2: 102581,
4: 60053,
8: 39145,
16: 27066,
32: 20272,
64: 13299,
128: 8389,
256: 5120,
512: 2616,
1024: 1382,
2048...