I have a slow grower too-- a little snow stripe I got from a rescue. She was 8 grams when I got her, and continued being about 8 grams until I realized that she was probably about a year old, and was kind of horrified. She started having shedding problems and developed a slight tremor as well. I started alternating 4 and 5 days between feedings, as mentioned above, and bumped her up to two pinkies a little earlier than the Munson Plan suggests, because she was always out cruising for more food the day after a feeding. I'm pretty sure she just has a particularly high metabolism. I also always slit her pinks. Makes them more appetizing, as well as more easily digested!
In her case, because of the shed problems and tremors, I started supplementing her with calcium at some feedings as well. Pinkies have very underdeveloped bones, and don't contain much calcium, and she really should have been getting more by that age. It worked-- she is shedding perfectly again, and lost the tremor. She was 30 grams at last weighing, and she's currently on one peach fuzzy and one pinky, because her head isn't quite big enough yet to handle a full fuzzy. I think in a few more feedings she will be able to, though. And since I am told that corns often have a growth spurt when they move up to fuzzies, we'll soon see whether that's true of Worm too!
Supplementing is a dicey business, by the way, and for a healthy snake, I am told it's likely to do more harm than good. But it seemed to be just what Worm needed, and as soon as she was consistently shedding correctly and I got her up to at least one peach fuzzy, I stopped supplementing her too. You'll probably never have to worry about that.
Good luck with the tiny one!