It is better to be a little underfed
than a little overfed.
Any tip burn means you went too far
and the damage is irreversible.
You will still make a crop
but yield will be less than nominal,
and flavor will be affected.
I am sorry, but I almost completely disagree with this statement for many many reasons. First, he is talking hydro nutes, and has not even mentioned organics or organic/hydro/cheny mixes. Second, he has not accounted for genetics, strain, vigor, medium or other environmental circumstances, actual light source amounts and times (which play a large roll), fans/wind rates, relative humidity, PPM and PH, nor has he accounted for the amount of actual solution fed to the plant, nor which particular nutrient brand he is using as a base to reference from. Which weeks to switch to which % and which amounts of feeding solution to be fed, how to look closely at both leaf and flower development to measure plant reaction.
Manufacturers recommendations is a safe zone that they claim that they have tested on a variety of different plants and can put a guarantee on it and feel comfortable with it (purely business, marketing, and profit/legality related). The recommendations are not the minimums or maximums for plants at all... thats why its a "recommendation". For example, the Manufacturers recommended use with Fox Farms Tiger Bloom is too heavy of a feeding for my Grape Ape, which is a strain that naturally takes in little amounts of water and nutrients to meet the desired goal of quality and quantity, my Cinderella takes in almost 3 times as many nutes as the Grape Ape (% in solution), and my SSDNL takes in 1/2 dose more than the Cinderella, with the GDP falling just in between the Cinderella and the Grape Ape.
When I underfeed my Cinderella, she grows more slowly, and does not react to the elements as well. I have overfed her twice, and didn't flush either time. Just the tips of the leaves got burned, about a 1/4 to a 1/2 cm of some of the tips, and growth just took off, about 1/3 better than with normal feedings. And as flavor is really adjusted and established a lot in the last two weeks of flowering, your nutrients wouldn't play as much a roll in flavor as long as your flushing.
Nothing Personal Earl... I just don't agree, and have good reasons not to.