What worked best for us was an "online academy", operated as a charter school by the school district. They offer assistance from certified teachers, online discussions of lessons, conducted the required state testing, kept track of progress and grades, set up field trips, etc. The quality of home school programs does vary, so check into the options where you live to see which will fit your family's needs.
We home-schooled up to the high school level. It was hard work, but it has been worth it. Our youngest is now doing very well at the local public HS. You get results according to the effort and dedication you put in. From what I can tell from your posts here, you have the makings of a good home-school parent: you know your stuff, are willing to work hard, and really care about your children.
(check your PM)