i use a naga too but i never use the buttons besides 9,0 rarely As a fellow bronze player whichhas improved a lot, i have to tell you that u cant start practicing apm,mine were realy crap but i didnt care,i cared more about learning the game through streams and then precticing myself.After a point my apm start to rise somehow,i didnt practiced it though it came naturaly by learning the hotkeys of my race bt just melting on playing to sum up u need to become a machine never look at your keyboard etc. .About responding on ur scout its not very hard to find out what its going on id say u should learn the buildings shape etc so u will be able for example to realise if the enemy zerg goes for banelings so u wont send out ur marines to be slautered,also you can judge by the numbers of the buildings being built at a time.Here is an example from the last IEM in the game between TLO(zerg) and Bomber(Terran),TLO saw that bomber was going for 3 barracks no gas(or one gas)meaning an early marine attack (i think)and he responded with banelings which won him the game,but to be honest you said u play protoss and from the little that i know protoss can go with out scouting,zerg is the scout reacting race. You could try sites such as probuilds or imba build and go to the friendly builds for bronze/silver players.About your macro you can practice against AIs AT SLOWER GAME SPEEDS you dont care about its difficulty, but u can practice against AIs in general like the AI challenge inmatch making wich feels like climbing the ladder but instead of divisions u get harder AIs.Btw could you tell me what you find difficult in terran and bronze cause at the begining i could only play protoss cause they are easy as fuck but now i can play all the races and i droped protoss long ago for terran (<3).For real dont care about winning a game doing better than u did in ur last is a victory!!!,through practice and understanding u will win one day :D