I know it's not a notional in-game way of doing it, but the Choose Your Own Stats (CYS) mod on Nexus lets you simply adjust the stats however you want once you're in the game.
For me, 27 us usually just on the wrong side of the comfort zone, and I usually want a point or two more, either to fill out one of the lessers stats so that a skill governed by that stat has at least some effect rather than none, or to bump up a main stat one or two points, so the mod is very handy for that.
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I think usually with rolling systems, you're going to be either taking what's given and working within it (even if it's a realy bad total roll) or just rolling until you get a decent total anyway. I've never understood the point of a fixed-point system - I guess it's got something to do with wanting to make an egalitarian point or sometihng like that, but that wasn't the idea of rolling stats to begin with, the idea was to take the "God given" roll and live with it, make the best of it, and then the idea of re-rolling came in to get better rolls for min-maxers.
