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@hugo7
It sounds like some people have problems with the EAI + goldtec, but not with DA... so go for DA I guess, they are good cogs. Maybe also check the transmission database to see what cogs people use.
When installing use lots of grease*, and screw it on slowly and carefully to start. Personally I think the rotafixing method, where you use the wheel to tighten it is better than a chainwhip. Just be careful not to damage your paint.
*copper grease is recomended by lots of people