I was going to suggest a light bashing too, after all none of the suggestions are any good for the one you've already eaten are they?!
I love sirloin, and rump - and ribeye too
If it's from a source you haven't tried before, but it looks good, you won't know till you try it, will you.
Eight minutes is quite a lot. Average-thickness steaks would be about 2 minutes a side for rare, 3 for medium, but only a little bit longer for well done, starting on high heat and turning down to medium.
I rub steaks with oil, season with lots of black pepper. I put Bb's in before mine, in a very hot griddle pan, since he likes his only pink, no trace of red; timer on for 2 minutes, then turn his, add mine. At this time, put a small bit of butter on top of his, spread it over, then turn heat down a bit. Timer depending on thickness, but for fairly thick, 2 mins.
Turn mine over, add butter; turn heat down to medium, baste his and turn; baste mine, turn, keep basting. By then they're about done, but I only use my finger to test.
Just press on the steak:
Soft and spongy = pretty rare
Softish = med rare
Soft but slightly springy = medium.
At this point, if taken out to rest (on foil, to catch the juice), that medium will become well done by the time it's served (on a hot plate).
Steaks should be rested for roughly the same amount of time as they're cooked.
While they're resting, add to pan a splash of water, or wine, or brandy, plus another knob of butter, then the juice from the foil.
Pour that over the steaks to serve.
If you want a 'proper' sauce, cook the steaks in a frying pan instead of griddle pan, and if anyone wants a few really quick ones, I'm happy to post some.