Not a bad thing, Nate, but actually,
14 gauge wire is a tad overkill, and not likely necessary to handle the
current needed to fire up the size bulb(s) used in a wall sconce.

The screw terminals in sconces, table and floor lamps, and the like, is
not sized to accept the wire you used - hence the difficulty getting it
to fit under the screws, and tinning fattened the conductors a bit as
well. The branch feeders in the wall case, of course, must be 14 gauge,
rated at 15 amps - but not the pigtails on the sconces.

16 gauge wire, and probably 18 gauge, would suffice, but it must have an
insulation rating of 105° C - rated to resist failure from
temperatures up to 105° C (221° F).

Joe