Tzolkin is a very good game !
It's realy damage for this "dominant strategy"...
I thought about a modifications for modify this situation.
With full technologies development Palenque 5 gives 12corn, while Yaxchilan 5 gives 16 corn after the resorces convertion.
Indeed, the difference between this 2 actions is too big ! You just reduce the gap.
I propose differents adjusments :
on the Yaxchilan 3 case : remove 1 corn
on the Yaxchilan 5 case : remove the 2 corns (or 1)
on the Palenque 3,4,5 case : add 1 corn
After that, I think the Palenque and the Yaxchilan wheel have a better balanced.