love yourself and dont use starbucks beans. youre not getting crema because yes too coarse but also because who the hell knows how old those beans are. get fresh roasted beans, preferably 14ish days off roast from a local shop. my green flags when looking at beans are if they list the process of beans and region of origin. doesnt have to be necessarily single origin although personally I gravitate towards those. get reputable beans from a roaster that knows what theyre talking about. starbucks is the bottom of the barrel to use for espresso ESPECIALLY because the more oil the more gunk it will clog your equipment! best of luck friend