I also do not use a Mono Backer.
I do however, use tape.
I typically cut a section of gorilla tape the width of the spool center (varies on spools how wide, just dont crumple it up on the bevels)
I will cut it half the length of the spool, i then double loop the braid and use a arbor knot, then use tape piece 2, over the knot and into the gap on the spool.
this way i get full coverage, even base, and minimal line reduction becase of the tape.
my favorite line is PP slick,
I have used many others, and prefer slick mainly because of the surface smoothness and how it glides across the guides.