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The south downs way will be shit. As long as you get thought that you'll be fine
I did this in a day last weekend https://bikepacking.com/routes/downs-overnighter/ and it was like a mini King Alfred's Way if anyone wants a shorter version
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A bunch of us did it last year, all on 35s - the maximum size we could fit on our normal commuting bikes. Here's a pic of my set-up. Was fine for the majority of the route. A few hike-a-bike sections where it was rocky and steep, and some slow going sandy parts, all mostly between Farnham and Winchester. But, most of it is perfectly doable.
just finished this in 3 days, it was and must be now almost completely dry overall, especially on the ridgeway.
4 of us on drop bar bikes with tyres ranging from 33 to 43.