I live in Indy too..don't know if you have seen any of my posts..had 9 (removed 1) macrophylla hydrangeas..only 2 bloom..east is the best location in my opinion..don't recommend these for Indy..have arborescens & paniculatas which are much better..gardenweb has many discussions about problems with macrophyllas in cold zones..

Tuff Stuff is actually H. serrota and hardier than most H. macrophyllas. It does better in my garden than any of the macrophyllas.

Marcie, can you add a photo? Is it mulched? Does it get enough water? Are there other plants overhanging? How close is it to a building wall? Mine get sun from 8 am until perhaps 2 and is happy in that exposure. I wouldn't recommend putting it in western sun, even as far north as you are.

Tuff Stuff is quite tough but if its root system got cut too much when packaging to fit into the pot, it may take more time to rebuild it and grow faster. Some hydrangeas will go slow for 1-2 years and take off afterwards. Mine was a Mathilda Gutges.

Extremely doubtful that it is getting "too little" sun with 4 hrs of sun. Even 1-2 hours would still be fine.

Better check that it does not get uneven watering because the 'dry times' could also cause the plant to abort the blooms and brown them out. And make sure it is not planted too deep.

Water the soil (never the leaves) very early in the mornings; say 1 gallon of water per watering (1.5g in the summer) and keep it well mulched so the moisture does not quickly evaporate (3-4" up to the drip line).

If you water the leaves and blooms, you might end up with fungal infections like Gray Mold (which browns out the blooms) or powdery mildew.