I'm quoting this post because this is a summation of all the issues in one, easy to read, simple post.
This is exactly how not to do it. How do I know this? Because it's how we all do it. It's how we start. Less than 1% of the car out there are sticks. Yet 90% of the keyboard heroes want to tell the stick guys how to do it.
It IS the tires. It IS the junk SS springs (had mine on for less than a month). It IS stone headed things like the pinion snubber (LOL @ at the guys who think these things work...don't post up your buddy running his...it doesn't matter he's giving up at a minimum of .2 with that crap). It IS cheap, non adjustable or 90/10 or 9 way shocks. It IS you can't tune your clutch so you try and slip the clutch. It IS your fly wheel weight is killing the tire so you have to lower the RPM. There isn't one clutch guy worth a damn in the country who will tell you slipping the clutch is a good thing.
It's all those things. They all matter. Any time you cut a corner with a clutch car, you pay a huge stupid tax. In broken parts, aborted runs, lack of consistency and just pure frustration.
It all matters. How do you control the motion of the rear spring if you can't tune the shock? That's like a carb without changeable jets. Who would try that?
For the guys with sticks, you have to know you just can't cut corners.
Get a quality clutch. You can now buy double adjustable shocks for practically nothing. You can buy light flywheels. You can get quality springs and taxation bars.
Do that, and you can tune the chassis and have fun and be competitive. Try cutting corners and you'll be on the internet taking advice from guys who've never drag races a clutch car in their lives.