I also agree with what the others have said, but keeping your line clean, and stretching it some before use can help a little with casting as long as your technique is sound. Slicking up the line won't cure a technique issue, but if the proper treatment is used, as recommended by the line maker, it too can aid the casting process.
BTW, I see you have Caylor Custom Flies in your signature. Is Roger still tying?
I had heard he had retired & moved to Florida!