Problem around hash spread is getting worse last days.

Actual figures:
Date              NLG Received by Gf7wGA  Blocks found   % of 576000
2014-09-01   336.000,26530000         336000            58,3%
2014-09-02   412.002,55330000         412000            71,5%
2014-09-03   461.001,62930000         461000            80,0%
2014-09-04   474.000,98565000         474000            82,3%
2014-09-05   497.001,14100000         497000            86,3%
2014-09-06   477.001,76475005         477000            82,8%
2014-09-07   518.001,02310000         518000            89,9%

Apart from a possible 51% attack, there's another problem: you see that other miners quit because Gf7wGA cheats by mining only at low diff.