You can tighten your stows if they are too loose. If you use Tube Stoes, look at the instructions included with them. Rubber bands can be tightened in the same way. Replace Tube Stoes or rubber bands when they appear worn. The Line stows must have between 2 and 3 inches of line through each stow.
Some jumpers make shorter stows because they fear baglock malfunctions.
That is not a good idea. Short stows don't prevent baglocks, but really do promote line dump. This is because they only have to slip a little before they are free. Remember, line dump is potentially more dangerous than a baglock, since it can lead to equipment damage and bodily injury, possibly incapacitating the jumper. The pilot chute has a big effect on canopy deployments.