How to pick a Turbo

[Hobo Ash]

Just to hijack my own thread- got a map which says its for a GT2056 so I could practice looking at it.
With a target of 160hp, the turbo needs to be able to cope with 16lb/min which this turbo can.
Boost target would be 25psi, which has a pressure ratio of 2.7. Ive marked the 2.7 with the horizontal line and this intersects the map at 17lbs/min. Am I correct in reading that that top line goes round to 70/71% efficiency for the turbo?
Using a compressor map calculator, my 1.9 engine with an efficiency of 88% can hit 17lb/min around the 3200RPM mark which im thinking isn’t too bad? Or would you say that’s a bit late?
Last thing, the turbo peaks at 24lb/min which using the calculator, the engine hits at around 4400rpm. Which to me sounds good because I wouldn’t need to take the car past 4400rpm for peak power output, is that right? Or will this just result in too many gear changes because itl be too inefficient after 4400rpm?
Not planning on using this turbo, just wanted to check I can understand a map