Hi Sue - Wonderful advice given here already - these ladies are great, aren't they?!?

I would keep the 3 in PHFHG and the 2 in LHFHG, but up the spelling using the LA plans in Beyond and up the reading using the ERS in Beyond for your older, and the math too if that fits skillwise. I so want this to work well for you, and I really feel like this is an important year for things to go smoothly as everyone will all be home together. I would not do more than 2 HOD programs to begin with, as you have a larger family and will be working on differing LA and math skills with dc even though they'll be combined for 2 core guides. You'll be busy enough, trust me!
I don't think LHFHG is babyish at all for dc ages 5-7. The read alouds are always several years higher than the child's reading level, and the rhymes, etc. are fun for dc those ages as long as they don't feel put on the spot, and as long as everyone gets into it.

I also think it's important to do the activities once and not draw them out. For example, the rhymes are meant to be a 2-5 minute activity - not a huge part of the day.

My dc loved them, but if they hadn't loved them, they take only a few minutes. It has served me very well for dc to know from the get-go that what is in the guide gets done - no ifs, ands, or buts.

They realize that every box has a purpose that is chosen with their age level and academic standards in mind. I think that you will love doing PHFHG and LHFHG together with your kiddos! I think they are accurately placed there, and I think you'll be able to enjoy your days working between just 2 core guides! The next year, you can always reassess, but for now, I really do believe in my heart that these 2 guides are your dc's best placement for the year to come. HTH!
In Christ,
Julie