Get better Intercooler Hoses. Samco makes great hoses.
Replace your clamps with these
http://www.turbohoses.com/Clamp.htm
Make sure there's no oil or anything slippery on your intercooler pipes. And make sure the ends of the pipes are dimpled, if they're not, they're more prone to slipping hoses off under hard boost. Get a better intercooler pipe kit (you can search for that.)