The idea of the part fan is to cool the plastic as quickly as possible once it is extruded in order to keep it in the correct spot. The slower that the plastic solidifies, the more the plastic will sag when printing overhangs/bridges. The stock part cooling fan/duct on your printer, Monoprice Maker Select Plus, is not all that great and would probably benefit from an upgrade.

As far as the Cura settings you posted, you should turn off most all of those experimental bridge settings. Your printer will still be able to print bridges without the 'Enable Bridge Settings' checked. The only one that would be useful is the the 'Bridge Skin Speed' since reducing the print speed effectively increases the air flow on the extruded plastic. More over you are turning off the fan for the 2nd and 3rd bridge skin layers which will cause them to sag even further.

A good bridging underside looks preferably like this:

This means straight long lines that have minimally sagged out. Why long straight lines? If they are straight and do nut sag out much, it is far more easier for the next layers to build upon. Please look at the difference between the above image and your own image, it looks as though you are missing more layers as the first bridge layer failed for others to build upon.

The idea is to get straight lines of filament from one to the other side. Knowing that filament is hot when you extrude it, it is difficult to bridge large gaps. It is impossible to think that enough part cooling will be enough to prevent sagging of the filament and have a perfect finishing at the bridge, there will always be sagging strands of plastic there. The idea for getting a good bridge (for other layers to build upon) is that you you need to solidify the hot filament as fast as possible to reduce the sagging. It is often best to reduce print speed and making sure your fans cool the extruded filament strands rapidly so that they become solid and stiff as quickly as possible.