Yes GH will maximize any test added to your body. I dont know exactly how but GH itself shuttles around the test and proteins etc. to where they need to go more efficiently or something. Im sure someone else knows more of what Im saying
Any and all anabolics will fare better when stacked with GH/slin due to increased shuttling of nutrients along with the addition of each drugs positive anabolic abilities. GH alone is a complete waste if done for bulking purposes. When stacked with Test, that changes entirely.