There is a LOT of misinformation out there that you can read... just make sure you are reading the advice of someone with tons of followers, who obviously knows a bit about what they are speaking of. I ran FF nutrients for a good 3 or 4 years and feel I know the product pretty well. I have also seen many come in here with diagnostic questions, who, like you, have been advised to cut back on the recommended dosages. Many many times I have convinced members to follow the instructions, and they have always been amazed at the quality this produces. Its just like the pH recommendations you get out here on the web... so many lazy growers feel that they can just adjust to 6.5, the middle of the soil scale, and that they have done a good thing. In actuality, you want to come in at the low end, and especially with FF systems, 6.2-6.3 is where the system best responds. I can predict with certainty that of you come in at 6.5 the entire time in a FF grow, you WILL have a rare trace element deficiency toward the end of bloom, molybdenum. It took a bunch of grows to figure it out, but when I went to 6.2-6.3, the point where the most nutes are the most mobile in the soil, those problems went away. You have to be very careful who you take advice from in this world.
So yes, follow the chart exactly... if you do, you will become a believer, and if you don't, you will never know what you grow could have become with the right nutrition.