The blue lake has a decided hip that the swallow doesn't have. In theory, that hip gives a place to turn on. It also allows the outline to more quickly bring in the tail. A fuller or more rounded outline in the tail tends to smooth out turns. The swallow with the swallow tail allows the tail to more easily sink when turning (less volume = less float) but at 230 you're probably pushing the limits of the board and my guess would be you'll already be sinking the tail to begin with, so the effect is probably muted some for you. The Swallow is slightly narrower than the Blue Lake, which aids some with responsiveness, but also creates a somewhat more parallel outline also aiding in down-the-line speed.
IS claims that the rails are sharper on the swallow. Sharper rails will allow that area to bite more and sharper (less rounded) rails release water better. Water will wrap curved surfaces, which slows a board down and decreases responsiveness in turns. If IS claims are accurate, the sharper rails would contribute to some additional down the line speed and rail-to-rail responsiveness. Wakeoutlaws.com has been pushing IS products this last year, and have several comments on the swallow, filtering out the spam element most folks to indicate the swallow is faster and more responsive than the Blue.
I'm not a big fan of the A frame quad arrangement on the IS products. The canards don't clean up the boundary layer on the rail fins and changing a pivot point inward towards the centerline of the board tends to fight the effects of the rail fins, IMO. That said, more fin area will give more bite and hence drive, I believe the fin setup discussed by Lance in the video is the preferred setup by quad users. A quad will give more drive, but also makes the board feel stiffer than if ridden as a twin fin - fins in the rail side box. Turns are more drawn out and sliding the tail (which is the failure of the fins to hold) takes more effort with a quad than a twin...big guys typically don't have a problem with overpowering fins though.
Both boards are heavy in relative comparison to other offerings in that size and shape. Inland probably does the best job in fit and finish of any of the wakesurfers.
Having ridden them both, the Swallow does feel more responsive than the Blue, but I'm 50 pounds lighter than you, so...YMMV.
My 2 cents, hope it helps.