I think you have missed the trance scene in Goa by a few years.
As a major UK tabloid said: "You are more likely to find a Chippy than a Hippy in Goa these days".
Not one to be a party pooper but the rave scene in the past was incredibly dodgy anyway. Whatever anyone tells you remember Goa is not Amsterdam. I'm sure you know what I mean! The government no longer want beach parties any more so if you get caught up in some dodgy goings on... the police are going to give you a seriously hard time and no one can help you!
Bars in Anjuna will play trance but it's not really a party. Still some day parties but to me that is ridiculous especially in the heat! Got to be a real desperado.
Instead of partying why not just relax! Goa is a fine place for that if you can find the space to away from Costa del Goa.