Slic3r Top Infill Not Solid

[Th3rd Dimension]

Hey Guys,

Wondering if someone could help me out here. I've got my prints fairly tuned in to my liking however my last issue i'm having is the top of my prints not being completely solid (they look neat).

I have turned up my extrusion multiplier to 1.3 which has made it a fair bit better, i've also increased my extrusion width top solid infill to 150% which has also improved things. i am currently printing the top layer at a speed of 20.

abs filament
extrusion temp 240
heat bed temp 80

have a look at the picture to see so more detail.