We make about 3 to 4 loaves a week and use Allinsons Easy Bake yeast. However when you start to get to the bottom of the tin the yeast sometimes gets stale (even though after opening the tin is kept in the fridge) and the rise is not so good, so we might end up binning it and opening a fresh tin. We also found Doves yeast wasn't as good. And if you use 'ordinary' dried bread yeast by mistake it produces a much lower rise.
If it helps, our loaves are 450g flour (usually half white, half wholemeal or sometimes granary, or thereabouts) , one measuring tsp salt, one tsp yeast, one tsp sugar, 335g water, 1 tbs butter, baked on large loaf, setting 4* wholewheat. The loaves produced are usually evenly shaped and well risen, especially with the Canadian flour.
PS * The 'quickbake' settings e.g setting 5 do not produce a loaf with a rise as good as the longer settings. And we often leave our bread on the longest time setting 13 hours so it is set up to run overnight to be finished baking the following morning.