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IME the 45 degree stroke will work with some and not with others. Some I use a combination of a modified roll with the 45 degree stroke. The rolling x will become easier with practice. The bottom...

If it is shaving great that is all that matters. Here is a PDF of a 1961 barber manual excerpt on honing and stropping. Great stuff and you'll note that a slightly smiling blade is a good thing...

No most are not absolutely straight. Some are, maybe more often than not, but not all. This is why the rolling x was developed by our fore fathers. If a bevel is even and symmetric from side to side...