I always suggest to be patient. Nobody is perfect. They are still very small and so good that they can not cope. They will improve. We must order welk in advance which is what I do, I order well befre something is . finished.
Itis not the brand of the lamp what matters. It is its wattage. 48 is the most powerful. If only one client has come back, something is odd with her. I do wipe also underneath. I would do on this client, fast underneath cure of 15 seconds.
I would not complain about a good product. They deserve to prosper. Many gels I have bought because I think I like the colour, what arrives is ot what I expected. It is nobody's fault. These are revolutionary products.