When placing your pad/pads on your V8, here are couple of thoughts:
1. Before placing gluing the velcro on your seat, place a straight line between bow and stern using a string. This will make sure that the velvro is nicely center (being anal here, but it will just look nicer).
2. When placing your seat pad, try to make sure that at least 1/4 of it is placed on the UPHILL side of the seat. That may help, but feel free to move it around and try for yourself what seems to work best for your liking.
3. If you really like a challenge, go for the multiple pads from Epic. They are "no-brainers" and near-perfect. Almost too easy… wish I had thought of that myself
4. Careful: pads will also move you in a more forward position, but will also move you closer to pedals (almost all the time). You may need to move the pedal plate away from you a bit.
As for the hip pads:
99% on flat water may not absolutely require a perfect hip-fit… but I find that it still helps. Totally optional, even if still good to have.
For the Epic pedals: have your tried a full 3-piece pad ?
May totally resolve your problem.