As far as we can tell, single and 10 pulls have no difference in SSR drop rate.
What you are fucking yourself over with is SR drop rates, though. Since 10 pull guarantees you a SR (assuming that slot doesn't drop you an SSR). There's plenty of decent SRs in game, useful for Tower at the very least.Kamihime is coded by incompetent monkeys, so it's possible. However, there's no way that the random function is the only part of the seed (if there even is a seed). Chances are the seed is the date and time, including milliseconds when the request reaches the server. Maybe a random part is added in too, which could be hit by that thing.
However, who is to say that your chances are LOWER when your seed has a 0 in it? As such, I don't think such a thing is necessary to even look into. Since we have no idea how the seed works or even what the results will be, it will never be enough to reach any kind of conclusion.