It's good that your practice online is close to what your RT's are at the track. Personally I prefer a practice tree that has an adjustable rollout so it can be fine-tuned to the car & track. But whatever RT's you get, it's important to first get as consistent as you can be. Then you can make mechanical changes to the car to improve the RT's. Possibly over time, you can improve your physical reactions, but it's difficult to try and vary them. Don't expect any big changes, but the little things do add up.

Things that help RT's:

* Shorter front tires.
* More air pressure in the front tires. (Be reasonable & safe.)
* A little more air pressure in the rear tires. But it is important to maintain a full width footprint for consistent traction. Wider rime can allow higher pressures while maintaining a full footprint. (i.e.: 9" slicks on 10" rims.)
* Radial slicks tend to react better than bias ply slicks. But they are more sensitive to track conditions and don't usually work well with a stick.
* Frame connector & 6-8 pt. roll bars stiffen the chassis and won't waste motion from twisting/bowing.
* Poly or solid motor mounts and front spring eyes. Softer rubber wastes time and motion by compressing. (DO NOT run a solid trans mount.)
* Front end alignment to minimize any stagger that may exist in your front suspension/tires.
* Rules require 2 throttle return springs. Safety first, but make sure they are not too strong.
* Stage at a higher RPM, or stage at a clean idle and then bring up the rpm's afterwards. But you gotta be quick so you don't get caught with the tree coming down. Also gotta do the rpm consistently. Good brake maintenance can help here.
* Carb tuning with the accelerator pump squirters and pump cams/adjustments can improve throttle response and 60' times along with RT's.

* Gears, shock tuning, converter and other things can also have an influence. Each car is different so results may vary.

* Rollout and subsequent RT's can vary from track-to-track, so try to test at the same one.