One thing to consider is the probability that counterspelling was deliberately made to be hard to pull off. In the novels, Harry vary seldom even tries to counterspell. And when he describes how it works, it sounds very hard and dangerous. You have to gauge exactly how much power was put into the initial spell when you try to counter. If you put too little juice into the counter, it does nothing. If you put too much, it causes unpredictable side effects.
Basically, you have to blindly guess at how many shifts the initial spell has and put that many shifts in the counter. Not enough shifts and its worthless, too many and the extra is fallout.
You could make a stunt that gives you bonuses to determining the power of spells, that would help make counterspells more useful.