Possible but what is the major goal gain muscle or lose fat. Plus if this increses the output in the gym then it could swing things even further to the positive try it I like it.
Hmm individual again. I dont personally go for High GI after the Surge. I go for more complex sources real food.
High intensity work. I would save it for another time. 99% of the time I wouldnt be able to do real HIGH intensity follow a weights session as I gave the weights everything I had for the most part. You may opt for something low intensity while drinking that Surge down.
How is your diet?? What about your training. Your are having real probs putting meat on the legs yet wanting to do cardio when all ready in a pretty catabolic state??
Really it boils a LOT down to finding what works for you and a balance of total dailky intake and some timing.
Hope that gets you started and helps some.