In reply to Millennial Oldstyle: crit welcome:
Here's what the narrower f looks like in two weights.
Image may be NSFW.
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In bold and heavier, the stem will make way for the counter. (Is there a name for that kind of /f/j/?)
For the bold and particularly extrabold, the ampersand got too crowded so I devised a new one (labeled 2 here).
Image may be NSFW.
Clik here to view.
Clik here to view.

My plan was to use form 1 for light weights and form 2 for the heaviest weights. Or should that #2 form be used in all weights? It's more /E/ish--I dunno if that's a problem or not.