Just like your sons, my son does not like writing. He also does not like Writing Strands. This year we are trying Jump In: A Workbook for Reluctant and Eager Writers by by Sharon Watson. He likes it! So far so good, but we are only three weeks into school. This program is a self-guided, child oriented program. It is written for the student to work through by themselves. They even write in the book.
On thing my son does not like is me reading his work. I made the mistake a couple years ago of being too critical. I plan to have him work through the book by himself without my input until he does a major project as in a short book report. At that point I will read his finished report to make sure that he has done all that is required.
Good luck. I am interested to hear what you decide to do and how it works.