If you want the longest casting mono, look for a tight-tolerance smooth line, such as Berkley Ironsilk. It is available again. Berkley claims it's the longest casting line on a baitcaster. Other tight-tolerance lines you might want to try are Stren Super Knot, Stren Duratuf, and Berkley Hi-Test. The last two have been discontinued, but can still sometimes be found. Don't expect miracles.

I also think the right baitcaster, one designed for long casts (most of the small ones are designed for pitching), could cast further than a spinning rod. Also, some spinning reels may cast farther... I know the old style Daiwa Whiskers did. Abu also has a new one with dimples on the spool lip... and there are other companies that claim long casting reels.

The lure weight seems to be at the light end I would look for a blank with it in the middle of the range
Blank may not load well

Bill - willierods.com