If it isn't crusting you may want to use some other methods for smoothing the cake-bakers scraper, hot spatula, damp spatula. I haven't had that problem when using a frozen cake either. I usually start to fill and crumbcoat...
If it is too soft and not holding its shape you need to add more powdered sugar. If they are falling off, you probably need to hold your tip closer to the cake so the icing is pressed a little into the crumbcoat.
Pam, I had to go to your FB page to see what $15 cupcakes look like, they are really lovely. Glad you can be properly compensated for all the labor in those miniature pieces.
No. If she doesn't care for your price she is free to make her purchase at Costco. Period. You may want to consider not selling in such odd amounts. It doesn't seem efficient to make 6, 9, 14 and 33 cupcakes in...
Look all over, somewhere there should be a tag or label that will give you a brand, model number, serial number, etc. If you can get any of that info you can do a search for a manual for it online. We have had pretty good...