*I'm confused, you said you're eating 60-100g of carbs per day, yet you eat 1cup of rice with each meal...this would be 100's of grams of carbs per day.
*If you put on fat as easy as you say, I would not up my carbs as high as you have or as you've planned too (still confused on that) Carbs do not build muscle, protein and fats aid in muscles building...carbs are only an energy source. Yes, they have other purposes as well, such as in a post training meal, but for the most part of for our purposes, they are simply an energy source. Fats also provide energy, and are a more stable source.
*If you put on fat easy, I'd limit my meals to 6 per day. This may or may not include a post w/o shake...that would be up to you.
*Is 4k per day too much or too little? Well, how much of that is LBM? Are you making progress off of less, if so I don't see the need to add more. That would just make you fat. If you're not progressing, then yeah go for more.
*I don't believe in the myth about eating carbs past a certain time of day. Possibly for an inactive person this might matter a little, but even there I doubt it. For a BB, this idea is pure BS.
*Last off, don't worry too much about the scale...don't gauge your progress by the scale....mirrors only or an extra eye if you've got one.