Yes2

Prestrafe best

video of another 287 - http://plays.tv/video/58659e40e0bbac543e/zpamm-loses-the-284-block-race (284 block)

screen shot of 287 - https://imgur.com/a/4X7tx (284 block)

[KZ] shamp has 4 big toes jumped 288.1062 units with a LongJump [11 Strafes | 275.822 Pre | 373 Max | Height 56.9 | 90% Sync | JumpOff Edge 7.659 | CrouchJump: yes | -Forward: yes] [278 block]
 #. Sync        Gained      Lost        MaxSpeed    AirTime
 1. 100%        9.049       0.000       284.871     6%
 2.  91%        12.760      0.000       297.632     12%
 3. 100%        11.146      0.000       308.778     10%
 4.  89%        10.082      0.695       318.165     10%
 5. 100%        9.024       0.000       327.189     8%
 6. 100%        9.126       0.000       336.316     8%
 7.  73%        9.267       0.000       345.583     12%
 8. 100%        8.607       0.000       354.190     8%
 9.  89%        7.264       0.000       361.454     10%
10.  89%        7.168       0.000       368.623     8%
11.  67%        5.181       0.000       373.804     8%