We used the Hake Grammar for 5th grade and honestly, we just used the grammar part mainly. My daughter took a virtual class offered by a woman close to us and she used Excellence In Writing. Of course, we started out the year doing the Hake writing, but it just didn't get finished. My reason for switching to Writing with Skill is due to what I've learned on this forum. Aside from that, I didn't know it existed. I've been used to using Writing with Ease and First Language Lessons, and we've liked those. However, until just recently, I didn't think Peace Hill Press had Language Arts for the middle school kids. That's why we had switched my older daughter to Hake.
Anyhow, I think you responded to my question regarding writing/grammar for the logic stage. So for my kids, I will still use the Hake grammar, but will use WWS I and WWE 4 for the writing, I think. But after getting all my curricula together, and looking through it, it may just be that we do both writing sections from each of those. We'll see how it goes. I certainly don't want to overdo the writing and have reluctant writers due to the heavy load.