From what I've read the TA seat mod doesn't raise seat height, it sounds like his design allows him to be more flexible with height, either adding or subtracting, best to consult him though. I have a Russell and it is higher than stock, I think their design makes it hard to keep the stock height. They do have a "Sport" model which I think allows them to build lower at the expense of a little comfort.
2009 Wee Strom ABS (current)
1987 Harley FXR Low Rider Sport (current - with 206K miles)
2009 Aprilia Mana 850, 2006 SV650, 1984 Yamaha Virago 1000 (all sold)
Silver Strom Club Member #11
Wee Farkles: Russell Day Long Seat, Madstad with Moose Adventure Shield +4'', SWMotech Centerstand, 1'' up & back bar risers, Givi XS308 Tankbag, Aprilia mirrors, Framesliders, Fenda Extenda, Elka Shock.