stiffer suspension, no lowering

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I don't know. Changing up sways at the track is fun to see and understand how they affect balance and handling, but if it was my car ( and it isn't) and tight mountain roads are my objective I would choose factory tuned M030 bars and stock drop links. They were designed to work together and they work very well. Adjustable drop links on a fixed/tuned sway bar are probably overkill. The Tarret links are well built but they are expensive. You could probably find a used set of M030 sways for $200 or less. The GT3/Tarret combo front and rear is around $1200 new. That is a big $ difference for almost Zero performance improvement. Ultimately though it is your car and your dough.