In all honesty, it's very rare to hear bloating etc from 180. There's a small chance it could be the WPI & if that is the case, we suggest you try the vegan formula to see if that helps.
There are so many factors that can be causing the bloating and it's difficult to pinpoint it to any one thing.
Have you had a gut test? I have one done once a year and it's invaluable and it would defiantly help your cause. I did a podcast on leaky gut here.