Not enough yeast

[DFitz]

I made a 30 gallon wash last night. heated the water, added 5 gallons rum, wash last night. When I pulled out my yeast bags (typically rather than use the remainder of an older bag I'll use in in a yeast bomb). Anyway, I realized what I thought to be 3 lbs of yeast were only about 2. In short, after making up my yeast bomb I only had slightly more than 1 1/2 cups of yeast to add to a recipe that would call for three times that.

It started out with a slightly foamy head and now is fermenting with a sort of effervescent look or champagne type ferment. Will this gain momentum or will I need more yeast. I have some Nottingham but really wanted to save this for another project.