With only the Standard Ballast bag in the rear how is the wake size with the direct drive? Obviously if it is not filled its gonna be pretty flat but whe filled is it decent? We don't do much wakeboarding like I said I just started last year but it would be great to get better and do a few things. We like to tube and kneeboard though. However I would like to try wake Surfing and imagine I would need an additional bag with a direct drive.