I can't say for sure, but I think jaybe may have hit
on the reason! With the spit swab you may be ending
up with more of a fouled situation in the bore. The
50/50 mix is giving you a cleaner & less fouled bore.
Therefore your groups are opening-up. But if SPIT
worked I'd use it. I shoot APP rem klenbores & the
50/50 mix works great for me in my Omega.
Chemically speaking the ammmonia is probably
removing some deposits in the bore that human
saliva isn't! My 2-cents Danny