I'm pretty sure someone has already asked for this but it would be really nice to get a Speed Mastery. Speed is such a critical stat for most characters, more so than attack in many cases. I suggest a Speed Mastery that would give up to 10 att speed in total. I think that's fair.
I'd take pots over graces. I already have plenty of gg's from the AP shop and can get plenty more. Free merc pots that don't expire after two days? Now, that's worth more to me because i can't get this many for free any other way.
I have nothing against going for the extra core but honestly it not a priority for me. I'm there for the titles and the seals. The extra core might be nice but I wouldn't notice if I didn't get it. I have a feeling many players feel the same way which is why most ppl don't bother with the breaks.
For all this talk about how terrible Lynn is, she is still my favorite char to play. Yeah, there's a learning curve but I have no issues with survivability or damage. She's far more satisfying to play than Kai or Lann. The way I see it, if you can't handle playing Lynn then just don't play her. I don't see any value in this discussion.