I use a 6wt Bass Bug taper on a 9' 5wt TFO Signature and love it. I can toss a bit bigger hoppers and small/mid size poppers. You won't wow your buddies with 90' casts but really push bugs with accuracy into thos tight bass pockets.
IMHO many/most of the new generation graphite rods do very well with a careful application of "over lining", though I think the term 'over line' is a misnomer as there is no danger in doing this.
Though same rods oftne do better with rated sink or sink-tip lines.
Axiom, TiCrX love a bit heavier line. I use a 7wt SW taper exclusively on my 6wt Axiom.
(5wt TFO Signature with 6wy Bass Bug
(6wt Axiom with 7wt SW Taper)