You got this wrong. You may balance them (the orchards and juice factory) but keeping the idea that the harvest yield would be about the same as olives (so accordingly, balance also the orchards productions we have now, adjust them a bit - if needed, after I finish Zielonka, we can revise the recipes again).
You can modify the price, but keep the ratio (peaches are expensive).
As for umbrella harvesting trees, would require for me to know better GE and 3D modeling. Now it is easy, because I only work with the textures. The i3d is still olives...