All problems you describe sound like there is a clog somewhere along the nozzle path. Perhaps it's been assembled wrongly, or your teflon coupler(the white thing) is deformed, that causes a lot of trouble.
Have you tried an atomic pull? Google atomic pull ultimaker. It's somewhere here on the forums and in the knowledge base. Can you upload some pictures here of the extruder head after doing the pull?
A bit of cleaning/a few new parts could solve all your problems
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tommyph1208 55
You don't want to buy an expensive UM2 head for your UMO... Take a look at some 3rd party quality products like the E3Dv6 (or v6 Lite)..
Lots of people (including me) use that with great success on their UMOs (and a ton of other printers), there are lots of mounts on thingiverse/youmagine, and depending on how you choose to do the upgrade it can be anyware from "really really simple" to "that wasn't that hard after all"
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