I seriously doubt that a 1/4” difference in LoP would affect your shooting performance.
Leave it as is until you pattern it. Then remove the pad and pattern it again. See how much difference the pad length really makes. DaC will have a much more dramatic effect. If after patterning the gun you have determined that the LoP really makes that big of a difference, then go with a nice horn plate or similar. Save the current pad. Do NOT shorten the stock!