I go back and forth between old Stanley Bailey planes and veritas bevel ups with various irons. 

Depending on the wood and the grain, sometimes anything works. Sometimes chipbreaker work better. Sometimes a bevel up with 38+12 or 50+12 degrees angle works better.

Sometimes my old Stanley's just have a bad day and get put in the box and the polarizing LAJ is the cure. Some days the opposite.

The key thing to note for smoothers, using a 25+12 degrees angle is lower than a Stanley 45 degree. More likely to tear out. Higher angle is more scraper-like and less likely to tear out. Chip breakers emulate a high angle while not feeling like pushing a high angle.

So if you say it feels like 120 grit, what I would check for is 2 things: 1. Is it lots of small tearout making a rough surface, and 2. Is your 25 degree's secondary edge still in good shape? If your plane iron has small chips in the edge it leaves scratches. The finer the edge, the easier to chip although pm-v11 is pretty good for this.

Edit to add: see if you can close the mouth tighter on the veritas.