I've also struggled with this issue from the moment I entered the corporate world and started wearing real trousers. I've spent a significant amount of money on 'learning experiences' and I hope you're able to avoid those same costly mistakes.
For reference, I'm 5'11 - 190lbs.
•45" chest
•35" waist
•44" seat
•27" quads
•16.5" calves
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I used to taper the life out of my trousers and bring them down to a mere 7" leg opening. I did so in effort to showcase my shoes(or boots), which at the time I thought were drowned out by 8-9" hems. However, I've come to realize that this was an unflattering as it was unsightly.
View attachment 780593
Recently I've been taking all my trousers back to the tailor in waves to have them redone. The above is ~8.5". Again, not perfect, but certainly an improvement...and the aesthetics of my beautiful shoes aren't compromised. A happy medium I'd say.
View attachment 780594
For casual chinos I've been getting away with 8" openings.
I see what you mean mate thanks for the photos!
Have you stumbled across any brands that fit better than others?