Hi,
I assume your using Lightwave 5.0-5.6 as Bryce can import files from that version as I use it myself for that purpose. When your using the sketch tool try and see if the are any points you can eliminate before you lathe the shape. I more often than not find there are to many points when using the sketch tool. When you go to use lathe click on the numeric button underneath and play around with reducing the sides. I also use LW 6.0 and that has a slider so you can watch it in real time. I hope this helps :)

Renderbrant