Watts per gallon rule is pretty much out the window when it comes to planted tanks, it's best to go by PAR
^^^That link will explain what PAR is, and what lights are best to get the best PAR vs Distance for your lights.
Jungle Val does best when grown under high lighting setups, but Dwarf Sag. will grow with low-lighting, but the growth will be slow. I suggest getting two 6500k or 6700k bulbs, the reason is 6500k bulbs are closest to normal sunlight therefor plants grow best when 6500/6700k bulb are used.
Also what are using for your Co2 source? Are you even supplying the tank with any kind of carbon whether it be DIY Co2, Co2 injection, or Flourish Excel?
There's really no set "acclimation" period for plants, just because everyone's tanks are different, and plants can flourish really well in 1 persons tank, but not so well in another persons tank that's identical.
Best thing I can say is to go through the forums, and just read everything you can in the stickies in each of the forums.......