Hmm, not sure I have anything useful to say, but I’ll ramble a bit incase anything seems useful.
I find how much I can eat before working depends on how intense I will be working. I may have a small meal an hour and half before, but I am okay if I just have half a glass of milk, or a small serving of Surge or something minor.
Another thing I’ve noticed is the need for a warmup. Getting the blood away from the stomach and to the muscles, before getting into anything extremely strenuous leaves me feeling better.