Remember:
Vinyl pool
pH 7.4
CH 90
T/A tests at 150, 180, or 200.

Unless your pH is consistently trending upwards, it's just not that big a problem. Yeah, fixing is probably a good idea, but it's not going to cause your pool to go cloudy or scale metal, not with your CH so low.

If CH was 400 or 500, or you had to keep add MA to control pH, then you'd have a problem.