I am a novice, but trained at Elstree.
Landed on 26 for the first time in 8 months yesterday and there was a little balloon-ette. Thinking about it, and your post, I think there is a greater tendency to do this on 26 and to land flat on 08. It's tempting to overreact to the slope.
Also, I was told to look at the end of the runway when I learned, and found it didn't help at all. Maybe I've developed a technique where I look ahead, but ignore the slope (if successful)?
I don't understand why you need to come in faster for a runway with a 'surge' - can someone explain? (But then I've missed a bit of this thread I think and have to come back from lunch now...
) I find wherever I'm landing it's easier if my airspeed is on the lower side towards the end. Surely that's universal? Power sometimes helps me control sink rate too, again, dunno if this has anything to do with undulating runways or not.