Fletched or un-fletched makes no difference and 10 or 12 yards should be usable.
The main key at this point is to insure you are always using the same arrow for each shot.
My suggested steps are as follows:
1. Follow PSE's paper tuning instructions until you have achieved a perfect bullet hole at about 15 yards.
2. At 20 yards, using a single fletched arrow sight in your crossbow using only the scopes elevation setting. If you find that you do not have enough elevation adjustment to bring your arrow down to the level of your targets bulls-eye this indicates that you need to shim your scopes rings. There are threads posted on exactly how to go about doing this. Please read and choose one of the methods that fit your needs or budget.
3. Initial windage adjustments can be a combination of scope adjustments and scope ring shims. It may also require additional movement of your arrow rest and nocking point. Remember when I said that all the paper tuning process does is to align your nocking point with the center of your arrow rest? Well, that's because they can both be to the left or right of the center of your crossbows lower unit rail. To avoid this problem I like to center my windage adjustment on my scope by counting the total number of clicks available and then setting my scope to it's center windage position as a starting point.
Then I visually look from the rear of my crossbow down the centerline of a loaded arrow, while the safety is engaged. I attempt to see if my arrow and rest appear to be in the exact center of my lower units rail. If not, I move both the arrow rest and nocking point equal amounts in the direction necessary to get them centered.
Once complete, you will need to shoot the crossbow at 20 yards to see where you are shooting. If using an HHA Optimizer insure your Speed Dial is set to zero. It's only windage that you care about. any adjustments are only made by moving your arrow rest. Once you are hitting center of the bullseye you are ready to move to 40 or 50 yards. If using an HHA Optimizer Speed Dial adjust your elevation and shoot a shot at 50 yards. Your Speed Dial Setting should be approximately 13.5 on the original tape or 8.5 at 40 yards.
At this distance once again you are concerned with your windage setting, so you can adjust elevation as needed to get the correct height, but you are here to set your windage, so if your arrow is hitting to the right or left of center you will now need to move your anchor point only to compensate for the windage change. This process needs to continue until you are shooting in the same spot windage wise regardless weather you are at 20 yards or 50 yards.
Once you have this correctly adjusted then move to 60 or 70 yards and do the same thing to insure your windage remains consistent.
By doing this exercise you are insuring that your arrow rest and string nocking point are both in line with one another and they are aligned with the center of your crossbows lower unit rail. You have then also aligned your scope to the center of your crossbows nocking point, arrow and arrow rest, so you know that it's always shooting exactly where you are seeing things through the scope.
Once you have your nocking point and arrow rest aligned correctly you can make minor windage adjustments with your scopes windage adjustment because if your scope is off its dead center by several clicks in either direction it's not significant enough to matter. You can always get these adjustments back to center on your scope by simply moving your arrow rest and nocking point a mi nut amount which will force you to adjust your scopes windage in the opposite direction to compensate for the change. This will get those scope windage adjustments back to center, but as I stated it's not necessary.
Any time you are trying to shoot a fixed blade broadhead your windage adjustments are much more critical, so if you do not have a perfect alignment between your arrow rest, nocking point and scope your windage will appear to be way off from where your field-points were hitting, so these adjustments would need to be performed in order to get them to fly well for you.
I hope this is somewhat helpful for you.
Regards,
Xbow755