the simple cast on is great for lace.. that 'loose' (almost sloppiness) is going to give your lace lots of stretch (when you block it.
I WOULD NOT use Long tail for lace..
you could try other cast ons--(if you are really unhappy with the simple cast on.
a crochet cast on using an extra large crochet hook would work..(ie if you needle is size 5, use a size 7 or 8 hook)
NOT a provisional crochet
, but crochet right onto the needle cast on
--see The Knit Stitch
(by Sally Mellville) or this YouTube