Some bows are not designed to be forgiving at all and you have to have everything - arrow spine, tune, intense concentration, and your shooting form - absolutely perfect to get them to shoot halfway decently. Heavily reflexed risers, short axle to axle length, radical cams and low brace heights are geared toward speed, NOT forgiveness.
Bows that have deflex risers, much longer axle to axle (over 40"

, soft cams or round eccentrics and high brace heights sacrifice speed for ultimate forgiveness and consistent accuracy. You can get away with some concentration lapses and form breaks and still shoot one accurately.
And there are all kinds of bows in between. Instead of basing your choice of bows on IBO ratings, you should choose a design of bow based on your shooting needs. Generally speaking, because there are exceptions to every rule, you must sacrifice speed for forgivness and you must sacrifice forgiveness for speed.
Choosing the correct bow design for you, with a grip that fits your hand well and has a comfortable draw weight/holding weight, is the first step in setting up a forgiving, accurate rig.
A thorough tune up with perfectly matched arrows is the icing on the cake - and I agree with Maverick that paper tuning is just one step in the process, not the end result. But if you don't have a bow that is capable of the level of forgiveness you want, no amount of tuning will get it done.