Well, God blessed you with the daughters, and He blessed me with the sons!

It sounds like you have a good plan for your dc next year!

I think you will enjoy doing Beyond so much. I'm assuming you meant DD#2 has just started the Early Reader's Bible? If that's right, then I think you've placed both of them so well for their LA and math, as well as within the core guide of Beyond. Even though your DD#1 can easily spell all of the List 2 words in Beyond, I think I'd still do the second spelling list with her because of the rest of the skills covered in the LA box with the words. Both of our dc could easily do Spelling List 2 when they did Beyond, but it was the rest of the skills they needed to strengthen to prepare for the rigor of dictation. Here's a post where I explained this, if you just arrow down to "my3son's" (that's me

):
viewtopic.php?f=6&t=5645&p=41357#p41357
So, I'd encourage you to have her do this box with Spelling List 2 in preparation for dictation in Bigger Hearts the following year.

In CTC, we are doing Level 4 of dictation, and it is plenty challenging, even though my ds has become an excellent speller, so I wouldn't have wanted to get there any faster.
To pave the road to combine DD#3 and DD#4, I wonder if you could do LHTH with the younger resources this year, and then with the older resources again the next year, only add in DD#4 that next year? Also, that next year, you could add in the K options from the right side of LHFHG for DD#3. Then, the year after that, you could possibly be able to start LHFHG half-speed with the 2 of them, taking it slowly to let the little one ease into it, and using the K resources for DD#4 and the first grade resources from the right side for DD#3 (though using just one science). I know that's down the road, but it's just a thought I had.
You'd also mentioned handwriting for DD#2. We did "A Reason for Handwriting A" while doing Beyond to cement our dc's handwriting, and it was easy to do and worked great. We just did a page a day. They loved writing the Bible verse on the special paper in the back and sending it to family members at the end of each week.
I think your plan sounds super! I just thought I'd throw out a few things in answer to your questions for you to consider, but you are well on your way to fine tuning your plan and will soon be off to another great year with HOD!
In Christ,
Julie