It's clear from delivery pics here some of your orders are very low value, under $30 in some cases. At a low profit margin that's not paying what your time is worth. I empathize with you. The new prices make perfect sense in those cases.
In order to keep your unbeatable competitive edge against the competition, and encourage people to make larger orders, I hope you'd consider a model of bulk discounts. I know you've mentioned you offer those on request, but that's time consuming for you and customers.
Instead of 15% off for everyone, which does nothing to motivate large orders, perhaps you could offer 5% off 20 strips of the same item, 10% off 30 strips...etc or something similar. So the profit is reduced per strip but the volume makes up for it, and you don't need to be troubled with a $20 order for 20 different items and virtually no profit. "Samplers" of just a strip or 2 should pay a premium.
I enjoy working with you and appreciate the efforts you're putting in. You could easily dominate this niche and start getting much larger, more profitable orders with the correct incentives.
, 
