I personally don't feel the need to "fix" this, IMHO it's a non issue as you'll only be generating satoshis anyway (and YAC isn't worth THAT much for this to be any significant amount). Also, AFAIK if you are p2pool minig and have a LOT of sub-YAC unspent inputs in your wallet (presumably at one address), they'll be grouped into one PoS transaction when you have enough of them older than 30 days AND they cummulatively exceed the 10 YAC minimum (please correct me if I'm wrong, haven't looked at the actual code for this yet).

As for the PoS blocks not meeting the 10 YAC minimum input: I think those were actually older than 30 days and thus eligible for a higher percentual PoS reward (5% per year, remember?), and those few extra days made a difference. There's a hardcoded maximum of 90 days, however, so be sure not to wait more before staking or you'll be losing out on that (that means if you have a stake-eligible pile of coins that's, say, half a year old; you'll still be getting a reward corresponding to only 90 days old coins).