Couple thoughts...
1. Yes, the one you posted looks like it has the normal amount of adjustability, but I doubt there's anything wrong with what you have. Your car must have an aluminum quadrant, as the stock quadrant is not compatible with a firewall adjuster. Did you install or at least check that your stocker has been replaced?
2. If the car doesn't start to move until the pedal is nearly fully released, then you actually need to adjust it closer to the firewall, not further away where an adjuster with 'more range' would help. If you spin the adjuster all the way to the firewall, are you getting any slack in the cable? It kinda looks in the pic like you already have slack. So, I'm having a hard time reconciling that.
3. As far as adjusting the cable, which I tinker with about every time I change my oil, I can tell a properly adjusted cable by pulling on the cable with medium force (maybe 25 lbs?) and getting about a dime or so gap between the adjuster and black plastic cable stop. From there, I fine tune just a bit if I don't like the 'sweet spot' in the pedal. That's the best way I can describe it, as the pull weight and sweet spot location is just a muscle memory for me. You must stay on top of the adjustment, as the clutch disk/pressure plate wear will require manual adjustment over time.
3. If you're really struggling, despite the above, then you can try a Steeda cable in place of the MM you have. The Steeda, which has an adjustable end, will definitely give you any range your firewall adjuster is currently lacking.
