Looks fine. Stopping in DFW twice should not be a problem. On my last RTW I stopped in SJC twice. I'm sure that when the owe first came out there was limit of 3 free stopovers. I just had a look at the current rules and there is no mention of this, just the maximum number of sectors and the possibility of purchasing two extra (previously you could purchase unlimited sectors). So strictly interpreting the rules it seems that you could do up 8 stopovers in North America (6 free, 2 paid for). I will put this to the test when I book my next RTW.