Waiting for baby to get grizzly for naps

Does anyone else do this with naps? Little one is 20 weeks and I know her wake windows are about 1 hour and a half to 1 hour 40 max but I’m waiting for her to get grizzly before taking her in and winding her down for sleep. I know this is a late cue but I find if I take her earlier it takes longer to put her down. Her cues are super hard to read so more going off the time and the grizzling.

If I get to 1 40min and no grizzling then I take her in and wind her down but thats rare!

Sometimes she grizzles at like an hour 10 and I just keep her distracted for another bit. Am I approaching this the wrong way?