Altitude hold tuning

I’m tuning a 7" quadcopter using the omnibus nano v6. It has a good tune on it, but I’d like to improve it’s althold behavior. It occasionally will lose a few feet in either direction. Is there anything I can do without adding a rangefinder? Looking at the log it appears that the barometer is all over the place. The FC is enclosed in the canopy with a bit of ventilation. I’ve heard of putting some foam over the barometer, are there other things I should take into consideration?

Look at the log here

You definitely need the foam. When I 1st flew my 3" with that FC and no foam just for testing purposes I saw the same thing.

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I added some foam and it definitely helped.