Normally, I don't think small differences in SAT scores make much difference at all, but in this case, I think calikid may be right.
Colleges report their students' SAT scores in their common data sets in 50-point bands: 750+, 700-740, 650-690, etc. If you're accepted and if you enroll, they get to put your Math score of 700 in a higher band than they would put a 690. So it may be the case that in the mind of some colleges, the difference between 780 and 790 is completely negligible, but the difference between 690 and 700 isn't.
At the very least, then, you should send the 800/700/780. If you send all your scores when you send your score report, it won't really make any difference. The additional 10 points on the superscoring won't make any difference. The fact that 790 is 10 points higher than 780 won't make any difference. But on the other hand, if you do send both sets of scores, no college will think badly of you because you tried the test twice and got practically identical (and very good) scores.