King Acrylite,
I'd stick with #4, #3 is the right "speed" but doesn't flow as well as #4.
Use a smaller wire, I screwed up the link above but it's
http://www.smallparts.com/products/descriptions/SAW.cfm
They are an excellent company to work with, you can peel strands off of a larger wire to get the right size if that's more convenient for you.
If you can wait only 5-10 seconds - this is usually plenty for extruded material IME.
The wire comes in 25' spools, I'm about out myself (I lose 'em) so if I buy more in the near future - I'll send ya some.
Maybe I'll change mine to King Polycast
Hope all is well,
James