Your "mechanic" has installed your packing incorrectly.
There are very good reasons for installing it in separate cut rings and I will try to explain.
1) The first ring on the male end of the stuffing box must sit flat against the male end with no overlap. This creates a much better seal at that end of the box so minimal water can get up into the female threads of the stuffing nut.
2) The idea behind cut rings is to allow water to pass between the shaft and the packing and not between the packing and the female threads of the stuffing nut. With overlapping rings it can pass on the outside of the packing MUCH easier.
By having the two overlaps, one at each end of the nut, allows water to enter through the male end of the box, pass up through the overlap, and into the female threads. The water then travels around the outside of the flax using the female thread valleys as a conduit and it then comes out the transmission end of the nut where the other overlap is.
This tracking of water outside the packing leads one to believe that they have a proper drip rate when in fact they may only be getting marginal water flow between the flax and shaft.
When the nut is overtightened tightened the flax is forced into the threads there by slowing the "drip rate" and giving the appearance to the "mechanic" that what he has done is correct, when it is not..
3) By installing flax as one continuous piece it can automatically "kock" (can't use c ock or the spell checker removes it) itself inside the nut when tightened and is very, very tough to adjust properly.
4) By overlapping you can not get as many true rings of flax inside the nut. Instead of three rings you may be relying on 1.5 rings of surface mating area as opposed to three.
Some yards employ good mechanics some employ mechanics who are to lazy to do the job right. I'd say you learned your lesson about the quality of the mechanics in this yard too bad it cost you a 1/2 hours labor to be show how to do it the wrong way.....
Remember boats are NOT the only pieces of machinery to use packing. Industrial pump applications also use packing and also use cut rings. This set of industrial directions specifically states "Never wind a coil packing into a stuffing box"
How To Install Packings