If you fit stiffer springs, go for thicker oil. Before you spend cash, you could increase the preload by adding a spacer on top of the springs, in the past I've used large nuts, two equal lengths of tubing, flat wire springs(perfect), washers and 2p pieces for fine tuning+ heavier grade oil. The problem with doing this is the spring can become coil-bound(bottomed out) as you are effectively using some of the springs travel but it gives you an idea before laying out your hard earned.
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