It depends on quite a few things, sometimes the same change (wider foam for example) can do the exact opposite to what you expect.
If you have a soft surface you might find you will get more grip with a firmer/bigger insert, as the harder foam forces the spikes to dig in.
On a harder surface a softer foam might give more grip as it collapses it presents more surface area to the track.
Because there are so many factors involved the best thing to do is experiment, what's the surface like you are running on, and what tyres are most people finding work best?
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