This sounds as bad as I did fear
Agricultural is now (by far) the hardest economy to get in a colony
- no planet type produces pure Agricultural
- all other economy types consume almost all agricultural exports (Industrial is even worse)
- a lot of Agricultural exports are demand-favoured
So the largest single-type Agricultural economy you can get is an Odyssey settlement, which only produces a small amount of a random selection of commodities.
But why does a Weak grade 1 link with 145% influence override a Strong link of 205%? The mere presence of geysers on the planet makes them throw away all of the commodities that industry would consume if the planet had any?
It's a lot more complicated than "one is bigger than the other".
Steel production, for example, varies between 14 and 58 tonnes per unit of economy size, while consumption varies between 3 and 58 tonnes (at least: these ranges may be wider)
So if you've got 145 consumption and 205 production, it's still possible for the consumption to end up higher, if it's closer to 58t/unit and production is closer to 14t/unit. Slightly unlucky, but can definitely happen.
And Steel is one of the most favourable metals for production. Copper is between 87 and 148 production and between 34 and 348 consumption, so even with average luck you might not see any.
Every commodity has its own set of ranges on both the production and consumption side, making some of them very resilient and likely to appear even from a minority component of the station markets, and some of them very fragile and likely to be wiped out on the export side by even minority components.
(Of course, if what you want is somewhere to
sell goods, your perspective is reversed on what these numbers mean)
Separately, the Weak Industrial Link is only providing 0.05 value. You can honestly forget that this is a factor because it's so minor.
Compared with the 1.4 from the planet in this scenario, yes - but in a situation where the planet wasn't giving Industrial influence, 0.05 from a weak link
can still mess up some Refinery exports (assuming 1.0 refinery). Beryllium, Semiconductors and Insulating Membrane would be particularly "at risk" and you might lose a couple of other metals too.
There are quite a few commodities which have the sort of 10:1 or 20:1 consumption

roduction ratios where even a few weak links can mess with them.