First check your center shot, sight your string up and down the dead center of your riser , then with an arrow nocked on the rest, sight down the arrow, the point of the arrow should appear to sit slightly offset to the string, either sitting on the left of the string if your right handed, or to the right slightly if you left handed.
If this is not the case then adjust your pressure buttons collet to get the arrow point to do this, this is setting your centre shot, once set leave it, it should always be slightly off center for
recurve bows.
Once you have done this set your sight ring to sit on the string.
Set your pressure button tension somewhere in the middle ie somewhere near the same tension as a click biro. then do a bare shaft test at 10 yards, that will tell you a lot about what's going on, don't worry about moving sights etc at the moment, just look at your groups.
Shoot 6 arrows with 2 unfletched, first check to see if the bare shafts are higher or lower than the main group of fletched arrows, if the bare shafts are higher then your nocking point is too low and likewise if they are lower than the fletched then your nocking is too high.
Adjust your nocking point first before making any spine adjustments etc.
Ideally you want the bare shafts to land within 4" of the fletched but the most forgiving set up is to have the bare shafts just low of the fletched about an inch or two.
Once you have done this you can check for spine.
The following is from the perspective of a right handed archer as there is not many lefties like myself about but if you are, then the following I'm about to tell you is just the opposite way around.
If you are right handed and the bare shafts are going further left than the fletched it means your arrows are stiff, ideally it is better to have slightly stiffer arrows eg the bare shafts are landing around 2"-4" to the left of the fletched, but if they are further out than this then either increase the poundage to bring them into check or get slightly weaker arrows. And likewise if the bare shafts are going right then it means they are too weak and you should seriously consider something different, I would say you probable wouldn't go far wrong with some
Easton 3-18 ACCs.
Once you have got your bare and fletched to group as described (slightly low and left for a right handed archer or slightly low and right for a left handed archer) then move to 20 yards and repeat and tweak if needed. Having done this then you can worry about getting the group to move to where your sight is set, always move the group not the windage (unless obviously it's windy!) But to do this, shoot a couple of fletched arrows then adjust the pressure button tension to get the arrows to go where the sight is pointing.
You can only tune as well as you can shoot, but once you start to get better then you can play with your bracing height range and find a height that yields a quite shot and tight groups at a good range of distances.
I know it's a lot to take on but I hope it helps
Good luck and good shooting!