Anyway, I find that Lowii likes cooler temps. Mine originally came potted in a peat heavy mix, which I was ever so grateful for . I have since moved to a much more open mix, as I find highlanders really like it (Lowii is almost ultrahighlander I believe). I use a 1:2:2 LFS:Perlite:Bark mix, with LFS as a topdressing. From what I understand, a much better mix contains no LFS or peat, but as I do not want to water so frequently, I use some LFS for water retention. Make sure to give a nice night temp drop and keep the humidity high if possible.
Can you post some pics of your setup and the Lowii?
EDIT: Oh yeah lose the baggy over time. If you are acclimating it to lower humidity, then open it slowly over the course of a few days (maybe 10? I'm not sure because I've never done this)... maybe poke holes in it gradually. Someone who grows on windowsills can give better advice.