You know you're supposed to let the plant mature and ripen before harvesting?
Am I reading between the lines correctly that you are simply nabbing nuggets from the growing plant? Are you smoking buds, or leaves?
What you are describing- 'like the beasters' is the unpleasant high of an unripe plant, one that has not been given its full flower time to finish. Most strains require 8 weeks or more to complete their flower cycle, and if they are harvested early, as Beasters are for reasons more to do with PROFIT than product quality, you get an 'unfinished' sort of high.

The plant must finish ripening, then you harvest and trim, then dry, then cure. After cutting down the plant, you still can't consider it ready to smoke for at LEAST 3 weeks.