I used to grow bromeliads commercially by the hundreds of thousands. One thing to remember is that bromeliads are very slow growing. That Neoregelia may well be 18 months old. That said, you will see very little growth in a week or 2 especially in the root system. Everytime you disturb it the plant is set back and needs to recover. Wraping the stolon in a little spagnum and securing it firmly or placing the rootball in a crevice will usually result in rooting within a COUPLE OF MONTHS. You are expecting too much too soon. The brown tips are probably from stress and trimming them off is the only solution that I know of.
Good luck.
Dave
Good luck.
Dave
