Uhm, I wouldn't know, I've never seen Crowley's Ten of Cups as a card of excess, at least in terms of intensity. It is excessive, in my view, not because it is too much, like the Seven, but because even though it is sated (is that even a word?) it is sated in a lowly, somewhat petty way. I mean, like the Seven it has mistaken pleasure as something for its own sake that is only found outside, like the Eight it is kept going by not being satisfied by what it has, and like the Nine it is sort of filled by it anyway, meaning that it does not look for something higher. Also, it is all this on a lower level (Malkuth) which doesn't have the strength of the other Sephiroth, so there is like a vicious circle in it: you are so unfulfilled that you feel fulfilled by random, low pleasures that, as soon as you obtain them, you find unsatisfactory. You could say that it is Love without Will in its worst aspect, and without any mitigating influence (the seven, at least, partakes of Tiphareth).
As for Mars, I see it more as the cause of the transience of the card: all the tens are instable, and to me Mars is the force that guides the transition from Water to Air by destroying the little power that Pisces still has, almost vaporizing it into Air.
At least, this is my take on that card.