Nice to see some people recognizing the power of carb cycling.
Everyone is unique so the key is to test. Your weekly cycle obviously works great for you PSCarb whereas I can't handle that many carbs without laying down fat. I actually just recently cut my weekly carb-up from 36 hours to 30 hours. Anyway, keep promoting the good word, you look great.
No worries Tall, Ketosis usually occurs below 30 grams of carbs per day for most people. There's no need to be in ketosis for bulking so that's why I recommend 30 grams as the starting point during a bulking phase.
As far as the metabolic pathways of carbs to fat. The mechanism works like this
Carbs - Increased Blood Sugar - Insulin increased - Triglycerides - Adipose Tissue (body fat)
There is an excellent, ground-breaking book on the matter by Gary Taubes called
The Diet Delusion. You might want to look into it and see what others are saying. It was called 'Good Calories Bad Calories' in the US if you want to google it.
As far as needing dietary fat to gain body fat, that was the belief 10 - 15 years ago. The dogma was, you need fat to gain fat. My belief is that the
body needs carbohydrates to gain fat. Anyway, it's a big issue. Do what you feel works best for you.
PS,
there's a good podcast on the matter here. If you get some time, have a listen mate.
Cheers,
Mark