I'm ~90% certain that a significant part of the issues with the nomads is due to a simple bad roll. While we definitely could use more martial, we don't need to panic. We're at parity, not behind. All the nomads who fight for economy are avoiding us, it's the ones who fight for martial glory that we're dealing with. More army would possibly get them to back off through cost-benefit analysis or through simple Darwinian selection, but we don't need it, as useful as it would be.
Assuming it is Glazed Pottery, It's a massive advantage which makes them able to transport liquids and be more durable. This has massive potential in a wide variety of applications from our metal studies (you need furnaces to do both glazing and metalworking), economy (better irrigation because we can easily transport water), and possibly even martial (easier to carry larger amounts of water around).
Yes? I don't see how that invalidates my statement, the bast way to deal with them for ~1-2 generations is Charriots. (We'll need to Main warriors as our next action after that to get more raw people though, true)The funny thing about the Nomads is that due to their clan structure the have the cultural memory of a gnat, love a good fight like 40k Orks, and we would only really be teaching this set of clans a lesson. The Nomads are only something we can deal with after we get really really powerful.