Priming Question

I brewed a Hefeweizen that I just bottled two days ago. The FG was 1.022 or so, which seemed high, so I decided to use 3/4 the usual priming sugar in case the yeasties continued eating what was left.

Turns out that the bag of priming sugar I grabbed was only 1/2 full, so when I used 3/4 of it, it turned out to be 3/8 the standard amount (1.5oz instead of 3oz of dextrose).

Any thoughts on how this will turn out? Anything I can do to help them carb up to a normal amount? I'm thinking I'll just leave them in a warm place and hope for the best. I don't really want to open up the bottles and add more sugar...

I'd leave em... Likely you will have an undercarbed beer, but that's preferable over opening bottles.