Here is my opinion, Being multiple tips, that would rule out a bad tip. Now, layered tips have a layer of glue between leather layers. This effectively seals each layer from the other. The glue you use to seal and or glue the tip onto the ferrule cannot go past that first layer, due to this barrier, so unless you use about half a tube of CA to seal it and most ends up loading to one side of the base, I can't see 'too much glue' being the cause. If you get excess glue on the sides, that would get cut off during the trimming process as these tips are 14mm, and most cues are 13mm or less. Cutting down and Shaping would also eliminate any glue on the playing side of the tip.
More questions: What type of ferrule material? Is this a pie laminated, or flat laminated shaft or a regular maple shaft? If flat lam or regular maple, I can see it hitting a slight bit different due to grain alignment, i.e. the 'spine' of the shaft feeling stiffer than 90 degrees left or right. A flat laminated shaft will be even more noticeable, One way to tell if it's the shaft/ferrule verses the tips would be to put a crayon mark where it hits firmer, and change tip and see if it still hits firmer in the same spot.
Again, this is just my thoughts and opinion, hard to say much more without holding and testing the shaft in person.
HTHs,
Dave