Hey @VegasVed !
I apologize for the very late reply! The technically correct way to make an い-adjective is by using しゅうございます. For example, the technically correct way of saying 美味しいです would be 美味しゅうございます, 嬉しいです would be 嬉しゅうございます. Although this is the technically correct way of making an い-adjective polite, it has not been used ever since after the war, because the Japanese Language Council decided that they will allow い-adjective+です. Although this is the correct way, not many Japanese speakers know this rule, and you would most likely never hear normal people use this for of conjugation.
I hope that answers your question!