[Legion5]

Even slightly wider tires are significantly more prone to aquaplaning, thankfully it has more to do with the front than the rear. However if your rear tires are significantly wider than your front ones without adjusting the suspension you'll get snap oversteer, which is very dangerous, which is why it's better to keep the stagger somewhat close to stock. The other good news is that your tire selection has a lot to do with aquaplaning resistance. So if you pick a better tire and go slightly wider in front and wider in the rear you'll be fine.

On a 2 liter diesel you won't be making enough power to take advantage of wider rear tires and you'll actually reduce performance because of the added rolling resistance and weight of wider tires. That's why economy cars have such narrow tires, because it makes the most of their small engines. Cars with big engines can usually just power through the rolling resistance and weight and they need the extra grip so it's worth it to go wide.

Realistically a 265mm rear tire and 235mm front will not give you any significant flaws on a 10" / 8.5" wheel setup so on these cars you don't have to try to force yourself to use overly thin tires. What you want to do is get the best looking wheels and just put the tires closest to the stock width that don't look too thin. You won't have any major problems if you follow that. However due to the issues mentioned above it would be silly to try to put a wider tire if your wheel doesn't require it because you'll incur no benefit.