Parting Thoughts of a Leaving Player

I don't quite follow why stamina and toxicity costs would need to be re-balanced, unless the maximum potential stamina and toxicity (and therefore presumably combat regen rates) were assumed in the balance calculations, since due to the increase in stamina costs with level it seems to be reasonable that using high end abilities requires a much higher stamina to use consistently (Most abilities double or almost double their stamina costs between ranks I and V), and the increase to potions over time seems to assume a similar thing, with the primary benefit in all cases being a higher efficiency at the expense of higher operating costs.

If the maximum values are the case, an alternative could be replacing the Stat-decision every multiple of 5 or 10 with an increase to all stats.   This would enforce an increase to minimum stats, without affecting maximums.