There is probably no way to tell if the springs in the bike are the correct ones. Do they have any sort of identifying number on them? If so, perhaps you could use that to determine if they are correct. Is there any kind of spacer at the top of the spring? There is on a VTX1300. Is the length of this spacer correct? Each bike takes a specific length spacer so maybe this is wrong. Get the service manual and see what the fluid level is supposed to be. You can download the service manual for free here on the VTX Cafe.