getting particle distribution to insert correctly

I'm trying to simulate a particle flow where I roughly know the distribution of particle size (vendor supplies a table of mesh size and mass %). While the range of particle size is decently large - probably about a max of 4:1 between largest:smallest: - the mass % at those extremes is fairly small.

Anyways, I'm trying to use multiple fix particletemplates for the differing mesh sizes, but I either seem to encounter an error messege saying:

ERROR: Cannot use neighbor bins - box size << cutoff (../neighbor.cpp:1670)

or

ERROR: Please use style 'bin' in the 'neighbor' command together with triangular walls (../fix_neighlist_mesh.cpp:210)

The second one is quite frustrating since this is after applying the fix that the manual suggests for the first error.

Please look at my input script and see if there's something I'm still missing, or if I need to change my bin size to something else I haven't considered, or of there's another problem entirely. Please be aware that this script has lots of comments - it is named "test" after all