if you dont properly use your core during exercises, you end up working your back too much, causing the pump in the muscles.
make sure to warm up properly, if you aren't a newb, then you'll need at least a 10min warm up, breaking a sweat within the first 5 min of that warm up.
everytime I start to even feel a little pump in my back, I just tighten up my core, and focus on engaging that area.
I dont use taurine or that other stuff. It may help, I honestly dont know, people use it. what I do know is if you properly use your core instead of letting your back muscles do most of the work you should be okay.
whats your training routine look like.?