even though i dont train lowers, i can tell you from uppers, your probably better off learning longer combos, i skipped learning basic face tricks like nose/chin/eye stalls and now all i can do is mainly rprolls/aprolls/prolls/ect. i havent learned sidehead-sidehead that well cause i struggle with my right side cause of injury
so try learning longer easier things will pay off with better style in the end, go easy/long, then go hard/short if that makes sense
sorry if im wrong im just tryin to help :p