You seem to not want the liners. Why don't you donate them to Gbasky, he will be eternally grateful!!They take up quite a bit of room versus an empty side case on my 14. There is a material reduction in the capacity that's available for use in the sidecase with the OEM bags used in the OEM sidecases provided with my bike. Sort of a volume of the case minus the volume taken up by the fabric of the bag thing. If you don't need all the space of the sidecases and want something easy to yank out, they might be useful. I could see the wife using them.
You refer to your 2014 bags as being too small. The bags have been the same size since Moses made the first FJR1300. Did you have an earlier FJR1300?