I am a Fox Farm user (including Open Sesame/Beastie Bloomz/Cha Ching) and go pretty much according to their hydro chart regardless of my light setup.
There are personal exceptions, but they are all based on the plant/strain and I won't preach others too much on these:
1) No Nutes in first 2 weeks ever.
2) Strains that can be nute sensitive get nothing for almost 3 weeks, then get ramped up slowly until about week 4/5 plants = week 4/5 chart. Back off if you see any plant problems. A good strain example: Automatic Lemon Skunk
3) Strains that you can overfeed get introduced to nutes late in week 2 and ramped pretty quickly up to week 3 = week 3. Once again, slow down if the plants look off. Then I will overfeed them at times starting around week 6-7 just a bit and continue this to late in grow when I am probably 25% over the recommended dose. Example: Diesel Ryders
I hadn't heard of backing off the dosage as you suggested. And I also grow in hydro.
