I think Christian mentioned something about the levels of amino acids being elevated for about an hour after drinking MAG-10. I'm not completely sure about that, since it may have been many months ago. That would mean that having MAG-10 45 minutes before training and none during is far from ideal.
The general recommendation with MAG-10 (as well as Anaconda/SWF) is to start drinking about 20 minutes before training and finish drinking 20 minutes after you finish training (although myself, and I believe many others, finish it roughly with the last set).
You could for example have 1 scoop 20 minutes before and 2 scoops during / immediately after.
What is your during workout shake like right now?
By the way, I've never used Karbolyn, so I can't comment on how well it works, but I would suggest using MAG-10 with SWF, if only because they were designed to work together. You can just mix 2-4 scoops MAG-10, 2-5 scoops SWF (and a scoop of Anaconda would be nice too) together, start drinking about 20 minutes before training and drink it throughout the session.