yep sounds like you have the same issue as me... dry cheeks and forehead, and yet oily nose and chin area. I break out around the chin now and then. But i do keep it under control these days.
my advice is this:
wash with a reasonably natural sensitive soap. Rather than a liquid face wash, or shower gel. I used to use clinique soap, but moved to TOBS sensitive because its cheaper, uses nothing but natural vegetable extracts, and leaves my skin feeling soft. Plus, like you, I adore the smell of the jermyn range.
shave with a good quality cream.... ive found TOBS jermyn works best for me, but you'll want to experiment and find what works for you. The truefitt and hill extreme comfort lubricates well and moisturises as it goes. Just dont get anything heavilly scented or coloured.
I'd say skip the alum (but of course, i'm not you, and you may find it works for you) and pat your face dry following a shave. Let the skin settle, dry for a few mins and then apply the witch hazel as a toner/splash. I get a good amount in my hands and work it all over the face. Witch hazel is intended as an astringent and facial toner, so it will help cut down on the grease across your nose if you make sure you apply it well to this area.
Following this, i apply a simple, non scented moisturiser to my cheeks, forehead and neck area. This routine has managed to keep my skin well under control.
The other thing i would suggest, is switching to shaving every second day. I find my spots stay away if i dont try to shave every single day.