Yes the TransGo spring is maybe slightly stiffer than stock, and a bit longer to replace fatigued stock items.
First you MUST not have slack at idle in the cable. What is the distance from the carb throttle shaft to the TV cable, center to center. Should be 1.093-1.125"
You should have immediate presure rise when you nudge the cable at idle.
If you have too much TV at idle, you can shorten the TV spring. Stock length is 1.900" IIRC.