I`m surprised Ultrahold is not keeping the edge in place...it`s one of the stronger glues. Have you considered using tape/s at the front ? For the curved part you can use contour tapes [shaped like boomerangs] ....although I find them a bit `fiddly`to work -with. Can you describe your glue application method ? Are you using ``Lace-release`` to break the bond? It`s a different % of alcohol to alcohol glue-melter....... alcohols have negative effects [drying] on hair, so frequent application can lead to early shedding. Also, there`s no need to apply knot-sealer weekly.... once in a month or 6 weeks is enough, depending on how frequently you wash the system. The lace has to be clean, dry and free of oils from your fingers etc....might be a good idea to wear thin latex gloves [the disposable type] when handling the system during your attachment. You may also find a different glue works best on your particular scalp....results with bonding-products can vary quite a bit from person to person.