Well I checked the level on the ground and it looks good...Can't really ensure that the bow is level when aiming down from the platform. Any other thoughts?
You'll need a bow vise or some way to secure your bow in a truly vertical position. Assuming you have a vise, using a torpedo level placed against your string be sure your bow is plumb in both directions. Be mindful that neither end of the level is on the string serving. Now look at the level in your sight. Unless your sight has an adjustment for this you'll have to use some bushing to level it. What I use on my hunting bow for bushing is nothing more than thin cardboard - something like your sight was packaged in. Simply place enough "bushings" between the sight and where it mounts to the riser - place these in the CENTER of the area where the sight touches the riser.
Once you have this set, be very mindful of your sight level when aiming. Start by drawing on what you know is a level surface - if your sight level is off in either direction, you probably have an issue with your grip. If you're confident in your grip, but still draw the bow and it's canted to either side, you may consider using side weights so that a "plumb" draw is automatic. I shoot left handed which means there's more weight on the left side of my bow (sight); however, I actually need more weight on that side. I use a Doinker A-Bomb with a rear mount that is just barely off center. Sometimes I still get into an "argument" with my sight level - I think I'm holding the bow plumb but it is telling me something different. I can assure you, if you have the sight level with the string, it is "correct" and if you don't "listen" to it you will shoot left or right.
Now to aid in shooting either up or down hill it is also important to be certain that your sight is at a true 90 degrees to the string. Place your bow on anything that will hold it steady with the string up. Use a light weight plumb bob and attach it to your nock point. Let the plumb bob hang down and tilt the bow as necessary such that the plumb bob string is hanging directly in line with your arrow rest - now look at the level in your sight. If it is not still in the center then you need to adjust the sight as necessary. Again, some thin cardboard works fine as a bushing for sights that do not have an adjustment. Again, simply place the bushing between the sight and where it mounts to the riser, but instead of center, place the bushing either at the front or back of the contact area.
Rinse and repeat until all is well. :wink: