I know people will be like blah blah you can't prove it. But I've never had problems like that skilling up since I started using
http://ffxi.lokyst.net/timer/crafttimer.html. And compared to these horror stories I here like this is way more than good enough for me. Well that and sometimes when I read it wrong and like do the opposite my skillups stop coming for some reason... weird
And on top of having a 94 4 60s not counting fishing/synergy on my main I got a mule to 100 bonecraft and 60 alchemy/leather subs in all of about 3months. All without going with those rediculous long spells of no skill ups.
Usually about a 1-1.5 stacks of synths got me 1 lvl. until around 90. Then it was more like 1.5-2. As long as I used that crafting timer well.