LJ, hope your are not under water !
Seem to remember the phrase, "adjust the chain for correct tension at the tightest spot", if it then does not seem extreme loose at some point do not worry (of course must not risk touching anything). IMO better with a little too loose chain than too tight.
For a test, mark the tightest spot on the chain as it is now, loosen it then change it's position relative to front \ rear sprocket and see if the tight spot moves, then make your deductions about what can cause it (off center sprockets, bent shafts, uneven chain), if you really want to go into it, and have plenty of time and inspiration, you may tweak the position of involved parts to compensate and distribute any unevenness between them, or buy new parts till the problem (by chance) goes away
Good luck
E.