The spacing isn't the problem here, I think. The above image contains two bars: a simplified bar then the actual supplied bar.
The first bar is playable - I can do 5 against 4 because I've practised it - but (for me anyway) that second bar with its nested tuplets is just not feasible, no matter how it's spaced or how much I practise it. The problem isn't legibility - you can see what the notation means - the problem is performing it.
That first pair of quintuplet quavers in the first bar becomes triplet quavers in the second bar. And the second pair of quintuplet quavers in the first bar become a quintuplet semiquavers in the second line.
If you were to present most musicians with this notation you'd get questions: What is this? And then you'd get a performance that only approximates what's actually written.