maybe the shredded wheat is throwing me off...but it seems like your low carb day has the same amount of carbs as the high days...? im guessing the myoplex shake has 42g carbs (if i remember correctly)
low:
3/4c oats - 39g
1/2 grapefruit - 12g
3/4c oats - 39g
5oz yam - 34g
myoplex shake - 42g
total - 166g
plus you said you have whey/dex shakes after workouts
high:
1 1/2c shredded wheat - 65g (estimate)
milk - 16g
1/2 grapefruit - 12g
2/3c oats - 34g
1c brown rice - 46g
total: 173g

am i missing something???