I had this same problem until I started stirring my beer. Once the beer is in the bottling bucket with the sugar in it, stir very slowly, making sure not to aerate it. This made my batches more consistent. Just be sure not to stir it too hard. Hope this helps you with your next batch.
This has nothing to do with the issue...what he is saying is, when he starts drinking the beer it doesn't taste as good as a few weeks later when he gets to the middle of the batch. This has NOTHING to do with the fact the the beer is improperly mixed with priming sugar. It has to do with him touching those beers LATER that the ones in the beginning.
It's like the old saying, the last beer of the batch is usually the best one. That's because
the beer wasn't really ready to drink when he started to crack them, but by the time he hit the middle of the batch, the GREENESS was gone. That has nothing to do with sugar not being mixed, it has to do with impatience.
It's not hard to grasp this...If my beer will be ready on week 3, and I start drinking them on week 1, if I get to half the batch on week 3, SUDDENLY they're going to be better, NOT because the priming sugar was mixed improperly, but because
the beer is finally ready.
In fact many of us believe that you don't need to stir. Because it AUTOMATICALLY mixes as you rack. You're flowing two nearly identical densities together, they're going to mix on their own.
What new brewers don't tend to notice, is that around the time that they begin to stir the sugar mixture they have also began to notice all the millions of threads on here repeating the mantra "Three weeks @ 70," and whether they are consciously waiting or not, at least their understanding that carbing and conditioning is a process that takes TIME to achieve. And they start waiting a little bit longer, and their beers are carbed when they get to them, but rather than it being simply that the beer is carbed because it's time to be carbed, they attribute it to stirring, which isn't really the reason.
I've never stirred and I've never had a beer not fully carb when the time was right. Stir if you want but more than likely that has no bearing on the rate or eveness of your carbing.