Increase tuple size

[HhvrshH]

Can I increase tuple table size to get more variants of moves? Now tuple_moves.10a have size 1315mb , tuple_moves.11a have 1215mb. On my machine I can run only small runs by command ./2048 because runs by command ./2048b fully load my ram(8gb) and after that process is killed. For example when I run small runs by command ./2048 -d7 2833 I get a score of 1556664, but in real games, the maximum result that I get from dozens of runs is around 400k. Can I improve my result somehow?

P.s (I use server mode to got right moves for real 2048 game)