The lack of exponentiation in crafting leads to rapid progression through tiers at minimal cost. Maybe each tier should have the products halved. Craft solar panels with four panels of a lower tier, recipe results in two or three solar panels as a result, rather than four solar panels. Currently producing a block of refined obsidian quadruples your power production (some exaggeration for effect).
The lack of exponentiation in crafting leads to rapid progression through tiers at minimal cost. Maybe each tier should have the products halved. Craft solar panels with four panels of a lower tier, recipe results in two or three solar panels as a result, rather than four solar panels. Currently producing a block of refined obsidian quadruples your power production (some exaggeration for effect).