Six cylinder torsion bars with big block

The xx/yy number are normally compression/rebound numbers; can;t say if these are real for this shock. Up front, the soft (low) rebound damping allows the front to rise quickly and the stiff (high) compression numbers slows the drop of the front end as you scoot down the track. The high compression number also fights diving and is probably keeping the front form dropping onto the stops. (But it is putting more load on the shock mounts.)

If you are primarily dragging, then the softer/smaller t-bars will result in better front end rise and give a bit more weight transfer to the rear. Makes all the sense in the world. If you are just dragging, then I can see how this works OK.

The stiffer rear springs will help reduce overall body roll, so that is helping you. Roll sitffness comes from ALL of the springs (both front and rear), plus any anti-sway bars front and rear. Since you are not doing any real cornering, the relatively poor distribution of roll stiffness (a lot in the rear and much less in the front) is not hurting you. On the road, it would likely be a more likley to spin out (lose the rear end) on gravel or wet, versus a car with better match of front and rear spring stiffness. But, you can make up for some of the F/R spring mismatch in cornering with a good front anti-sway bar and no rear anti-sway bar.

The larger/stiffer T-bars are NOT appropriate for all cases. Rough road handling is hurt by too stiff a spring, and moreso when the shock rates are anywhere close to properly matched to the spring rates; too stiff a spring & shock comob reduces the RATE of suspension travel and the AMOUNT of actually used travel; this reduces wheel compliance for bumpy surfaces and breaks cornering traction easily over bumpy surfaces. If the driver likes the really stiff stuff, then it is likely he/she is doing most driving on smoother surfaces. These are the reasons why offroad racing and rally cars don't use nearly as stiff a spring rate as road race, auto-x, or circle track cars.