I usually just consider the spacing relative to other elements, rather than spacing within a fixed page. So, in your example, how far the heading, subheading, and quotation should be from one another, not where they land on the page. I tend to crowd the top a little more than I would for print, and I might force a break if I really want to avoid weirdness.
So in your example, I'd probably drastically reduce the space above/below the subheading, and if I was feeling really fussy, I might also force a break before the quote.
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