Let's keep working at it Raman!
So nice to have a big 20 sec track. Post a video of your runs.
Traction rolling with M06 is hard to do, you must have super high grip carpet.
Or is it your Alfa high cg body? hehehe
One reason I chose short wheelbase is the ultralow cg of the Silvia S15.
Then softer springs with hard sway bars to help counter traction roll. Rear max track width. Height 3.8mm f/r.
I'm sure you can break the 19s barrier as there are infinite things we can still do to improve.
Myself after a week of testing, 1.4% improvement from my baseline. Around 4 sec for a 5 minute race.
Still nowhere near finished, which keeps me interested.