Need advice

This might be a stupid question, but I’m looking to start dead stretching up to 38mm, after just downsizing to what I thought was 28mm (that’s what the listing for the plugs was for) for about a month and a half. My plugs that I’ve been wearing every day at “28mm”, are actually 29.56mm, and the flares being a little larger obviously. My question is, do I buy 30mm single flair glass for my next stretch and only go up the .44mm, or buy 31mm, and go up less than 1.5mm. Appreciate the help!

This might be a stupid question, but I’m looking to start dead stretching up to 38mm, after just downsizing to what I thought was 28mm (that’s what the listing for the plugs was for) for about a month and a half. My plugs that I’ve been wearing every day at “28mm”, are actually 29.56mm, and the flares being a little larger obviously. My question is, do I buy 30mm single flair glass for my next stretch and only go up the .44mm, or buy 31mm, and go up less than 1.5mm. Appreciate the help!