We are a Love and Logic family too, but I understand your question about communicating and his frustration. You will definitely want to get the DVD (or book but the DVD is really good and quick) "Happiest Toddler on the Block" by Dr. Karp. I use these two resources for my children.
Glad it is working....you are doing it right. When it is not going so good, reevaluate whether you are doing your part right (not warning, too many words, etc.) Usually when things get crazy here, I am the reason.
We are starting a new Love and Logic class at my church in January. Cottonwood Creek Baptist Church in Allen, TX I believe it starts January 10th in the evening....may want to watch the website for more info if interested. Cost is free; workbook is about $15. Both parents encouraged to attend; childcare provided.