Based on your answer to my question, I can tell you with certainty that the problem is not with your drain piping, but with the type of strainer you have in your sink. Replace your strainer with one that is less restrictive and you will notice the difference. You may think I'm nuts, and I may be, but when it comes to plumbing and solving problems like this, I know what I'm talking about. I am a Master Plumber and have been in the trade for over three decades.
2016 Rockwood Windjammer 3029W Diamond
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW