I roast is a different beast to the larger roasters and from my limited knowledge of short roast times are normal. I would recommend doing some roaster specific research/googling on tips techniques and profiles for this roaster.
If you want a benchmark for your own roasting buy some good professionally roasted beans. There is no substitute for your own senses.
If you want a benchmark for your brewing and your unsure on how your shots stack up then go and visit a recommended cafe from the "good coffee where?" section. Just be aware that its very difficult to replicate the shots made with a Robur and Synesso on home equipment even using the same beans. Never mind though it will give you an idea of what espresso should taste like, your coffee may be closer to the mark then you think.