Report after 2 weeks:
Not much of a progress as of now. I did incorporate yums and potatoes on the days of my heavy training (that's when I do double training = crossfit + sand). Increased my carb intake to about 120grams on those days. Keep myself to 80g on remaining. No weight change, no visible muscular changes, no measurement change. The only noticeable difference are energy levels and ability to fall asleep. When I was eating 80g or less, I was having very difficult times falling asleep even though my body was exhausted and needed a good sleep to recover. Normally on SAD diet, I would hit the pillow and be asleep but I suspect low carb diet messes up with my brain ability to shut down. When I upped my intake to 120g, I can fall asleep much faster and sleep soundly.
Energy levels seem to be much better too - I can sustain myself throughout the day on 3 square meals even with all the training. I know the training is not what Mark recommends but you have to touch the ball this much in order to compete on that level. I want to give it a full month which would be the end of May to see if anything changed before trying to tweak things again.