Max,
I appreciate the differences between 319s at 55t and 321s at 75t. I've flown all variants within the 320 family and both engine types.
I agree with you about windshear protection in managed with G/S mini. Here's an extract from one of my earlier posts:
I must stress that I am talking only about approaches in strong gusty winds and their associated low-level turbulence, not about approaches in conditions in which a genuine windshear could be encountered (as opposed to gusts of +/-10 to 15kts, for example).
Should there be a weather front passing through the airfield or large Cb in the vicinity, rest assured - I'd be in managed. I'd also be landing in Config 3.
If you miss yout touch-down-point, you go-around so nothing unsafe there.
Being commercially minded, I'd rather not give the passengers a go-around and an extra approach they haven't paid for if I can avoid it! Adopting selected speed on very short runways in certain circumstances can reduce the likelihood of going around. It's horses for courses.