Launch, springs vs bags

[GreyHoundSteve]

This is something i have been wondering for awhile. Will a bagged truck be able to take off as well as a static dropped truck? The reason i ask is because my Supra had a better gate time after i swapped out the stock springs and shocks for a pair of eibach drag launch springs and bilstein shocks. I was told the improvement was because the eibach's were stiffer so they kept more tire on the track. Is this true? If it is then one can only assume that a truck equiped with bags wouldnt grip as well because of the softer rear, that is unless you fully filled the bags and in that case i would think any improvement in launch would be negated by the extra wind drag. What do you guys think? Will a bagged truck hook up as well as a static dropped truck on a track?