X2 99% of the time it's the return lines. Rarely injectors leak at the halves. When they do, and excluding they somehow got lose, you generally cannot fix that.

As a caveat, I am not trying to generate a forum war of over the benefits of lapping or not lapping.

So, leaking halves is unlikely. 59 Ft Pds is the max. At this point, I would not remove your injectors if I were you. If you pull them, no more than 59 ft pounds. If you overtighten, and really overtighten, they will leak.

My .02 cents