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Nice! I think out of the box I was happy with around 2-3 for espresso. Have since popped a pair of shims in there. I went for the filter burr too which came with a pair of shims fitted which put it up around 26-27 so popped those on the espresso burr so they're both roughly middle of the range. I guess they set them up so you can use the supplied burr for both espresso and filter and just aren't accounting for how light a roast some people use for espresso.
Occasionally, I've not done any side-by-side comparisons but I can't see a significant improvement with the filter-specific burrs. Oddly enough, at very coarse grind settings, the filter-specific one produces a lot of fines (much more so than the original one). I'm not convinced it's worth the £30 personally. Do need to have some proper side-by-side comparisons but the regular burr is perfectly fine for filter brews