Shakespearean tragedy. Tragedy is the designation given to most tragedies written by playwright William Shakespeare. Many of his history plays share the qualifiers of a Shakespearean tragedy, but because they are based on real figures throughout the History of England, they were classified as histories in the First Folio.
Take a basting brush and spread extra virgin olive oil on both sides of the steaks. This will impart a great flavor on the meat and serve as a anti-cticking agent. If it's good quality sirloin, then all you need to add is some sea salt and fesh ground pepper on both sides of the steak. If you are looking for additional flavor then you can put the sirloins in a ziploc baggie with your favorite BBQ sauce for about 30 minutes prior to grilling. And never cook a steak past medium.
You might also try the cookout calculator at charcoalbob.com. Enter the details like the type of grill (charcoal or gas), the thickness and doneness you want. It will give you instructions for how to grill sirloin steak more like you want it. It also has grilling tips. Also, if there is a lot of salt in your seasoning or marinade, this can draw the moisture out of the meat. The recommendation to slice thin across the bias of the grain will also help to reduce the toughness.