Hey it looks like the belts might be a little loose. Go ahead and check the tension and if they are a bit loose, tighten them like in step 2 of this ohai https://ohai.lulzbot.com/project/Final-mechanical-assembly/taz-6/ . Be careful not to over-tighten them as that can cause other issues.
As far as the top feature being blob, you can decrease speed, increase fan, or print two of the same object at once to give each layer a chance to cool off. I believe there is a minimum layer print time in the cooling section of the advanced settings in cura. Increasing that should help that top feature turn out better.