There is a vertical wind tunnel in Clifton Forge, Tennesse called "Fly Away" which I used while in my training. Although, in retrospect it may have been counter productive because of the lower wind speeds. Due to the lower speeds they use very baggy suits for more drag which causes you to have a different body position than in freefall. I would recommend going to a tunnel which will allow for a normal jumpsuit like what you have been jumping to truely help your technique. The tunnel in Orlando would be your best choice.
Ask lots of questions and listen to your instructors.
Goodluck with your training!
CG "Very Dangerous, You Go First!"