... lately I have been disappointed with it's handling of .dxf files as well as .png, .bmp and .gif. A lot of the imports become blurry; I wish someone could please explain why.
I expect that your problems with PNG, BMP and GIF images being "blurry" is that they don't have the necessary resolution. You should go for, at least, 200 DPI (aka 100 LPI) for a reasonably sharp image. If your board size if 5"x8", that would translate to 1000x8000 pixels.
TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1