Hello crimson - welcome to KeyShot world!
Making something look good for all angles can be tough sometimes. What you probably need is just something more to reflect at those angles, so a good environment is key. I assume these are completey flat surfaces giving you a hard time. Try using an environment like the "3 panels tilted" or an outdoor one. What I like to do is go to that angle (that looks dull) and play with the environment settings there as the rest of the angles should look good since there are more things happening and such. Hope this helps some.