RDB,

My first observation on your BackTests is that i see the same thing in the same time....

After the end of october, profits are really rising.
At the beginning of the year they rised but stop really rising after march.

I think there is "winter/summer hour" effect.

22/6 is good for the period november/march
but for april/october 23/7 is better.

Maybe there something to dig here?