Driving versus equipment
From an old guy (50's, won't go any further than that) who has been draggin cars for many years (my first was a Fairlane that ran mid 9's with me driving), the technique of dragging is a learned thing. As you learn to drive a car better down the strip, you will learn what they do at the edge of traction better, and that is what will help your times more than anything else. I know my limits, as my "street" Mustang (520ci blown Promar engine) will run low 9's (best was 9.12 last summer) with me driving, and has dipped into the mid 8's with others driving it. My daughter tried driving it last summer, and ran a 10.2 (she's 16), but she also has spent time in karts, so she knows pretty well how to drive a car. Practice, and you will garner skill and knowledge. Your car is a beast of a Mercedes, and should be a fun thing for you to run for several years. I took my 55 out to a local event last night to watch some kids I know (some young man was there with a Super Snake Mustang - really fast street car), and ran a 1/8 to see how mine would do on concrete with no prep and only a minor gumbo run - I ran an 8.35@83 mph, should be good for about 13.1 1/4. That's about the limit of my ability in the car with the current tires on it. If you can dip below that with a similar car, you are a very good drag person - best way to get good is practice and examination of your runs. With times like yours and some practice, you will soon be killing me.