I would try various angles of the seat bottom to increase or decrease the thigh, knee support. Tip it up in the front and extend the thigh support for 1 week, see if that helps. If not, lower the front and pull the support back in.

I have long legs and found I need a lot of knee/thigh support for the most long term comfort.

The BMW Performance Center has these recommendations for seat adjustment.
1. Adjust fore/aft to be able to floor the brake pedal and still have a slightly bent knee. The gas pedal should then be a proper distance too.
2. Adjust the height so your head is within 2-3 inches (fist width) from the roof. This gives the most visibility. This is more elevated than some like but gives the most control too.
3. Adjust the recline to be fairly upright but comfortable. "No ghetto driving with the seat fully reclined please..." You need to be at least 10-12 inches from the wheel/air bag. The bend in your wrists should be the exact distance to the top of the wheel so there is a comfortable elbow bend when at 9 and 3. With the multi contour, you can adjust the upper back to fine tune the distance and get the proper shoulder support.
4. Adjust the top of the headrest height at least to the height of the top of your ears. You can use the multi contour upper back adjustment to bring the headrest in closer.
5. Adjust seat bottom angle for proper support of knees, thighs, etc. Re-adjust recline if necessary.
6. Fine tune fore/aft and recline to not loose the proper distance to the brake pedal. If too far from the pedals, move forward and use more recline. If too close, back it up and use less recline.
7. Adjust anything else to comfort.
They said the proper position gives the most control, support, long term comfort, and safety all at the same time.

__________________
Richard
Sir Snaps-a-lot, 9 Time Dragon Slayer (54 runs!)
2011 X5 50i Alpine White, Biege Nappa /Lt Poplar M Sport
2009 Z4 35i, Black Sapphire/Ivory-Black/Anthracite

Gone but not forgotten: '08 550i, '06 X3, '06 650i, '02 M5, '99 540i