Whole wheat bread not rising enough with Instant Yeast
I'm new to bread making and I am making breads successfully since last 6-7 days (thanks to TFL). I used to use active dry yeast, but started to use instant dry yeast since yesterday, to save time in rising. But, my breads are not rising enough.
Here's my recipe:
2 1/4 tsp instant dry yeast
2 cups whole wheat flour
1 cup all purpose flour
2 tbsp sugar
1 1/2 tsp salt
1 1/2 tsp milk powder
1 cup water
1/2 tsp gluten
1/4 cup vegetable oil
After mixing all dry items (including instant yeast), I add warm water (approx 50 degree C) and oil. Kneading for 10-15 mins and keeping it aside for 10 mins, I put them in the loaf pans to rise. I wait for more than 4 hours but the raising stops after 2 hours. It doesn't even fill up the the pan.
While using active dry yeast, the process of first rising takes around 30-45 mins and loaf pan rising around an hour or so. Then bake it for 30-35 mins at 175 degree C in my OTG.
As far as my little knowledge goes, many bakers use instant dry yeast for its fast rising quality. Can't understand exactly where am I making mistakes.