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Volumewise, the 2 subsections that I want to remove, each take up about 1/6th of the homepage.
It used to be the case that when a new internal page was added to the site, it would rank in the top 5 and the HP would join it creating a double indented entry. It's now the case that the HP often ends up on page 2 instead. I'm wondering if this is because the HP has become too long.
Creeping link growth on the Home Page is one reason some sites get into the Mega Menu problems [webmasterworld.com] we've been discussing in another thread.
I took out one subsection from the bottom of the Home Page and gave it it's own page. Many of the internal pages that have had their links moved to this new page have been boosted in the SERP's - most to #1. One of these pages even displaced a competitor who had sitelinks.
No change to the position of the Home Page or other internal pages that are still linked from it.