Skip the oil, bubblehash is a far superior product. I get approximately 1oz/lb of trim using trichome-heavy strains like White Russian and Blueberry crosses, less if using sativa's that don't have as many. If you make it while the trich's are still in the cloudy stage you'll end up with a lighter color hash, much like blond lebanese while using trich's with some amber in them gives you a reddish chunk.