[LAU] Unplayable midi song

I have recorded piano tune with Ardour3beta2 which seems to be unplayable with the Salamander Grand SFZ file using LinuxSampler. I recorded the piece as a midi track using Pianoteq and then wanted to bounce a version record using SalamanderGrand/LinuxSampler, but found that some notes were skipped in playback. I conclude, after many tests as described below, that it simply has too many repetitive notes, and LinuxSampler/SalamanderGrand cannot keep up. I have played quite a bit with LinuxSampler/SalamanderGrand in live practice, and not seen this problem before, but this particular piece seems to point out some weakness in LinuxSampler+SalamanderGrand. At first I thought it might be an Ardour issue, but the midi would not play properly in Qtractor either, and then I discovered that I could not play the piece live with SalamanderGrand/LinuxSampler either. However, the piece plays fine with Pianoteq or Linuxsampler using jRhodes3.sf2 or Maestro_concert_grand_v2.gig. The only other SFZ file I have is the Ibanez_roadstarII_series_fingered.sfz (guitar) which also worked fine, with that caveat that this intrument does not have the full range of the piano and only has 66MB of samples, compared to 1GB+ for Salamander Grand. I have also tried increasing my Jack latency to the maximum amount I could (280ms), but that did not help. I tried several flavors of Salamander Grand 44kHz 16bit, 24bit, and ogg, but that made no difference. So I conclude is something about LinuxSampler+SalamanderGrand combination which prevents this song from playing properly. I've posted the midi file here in case anyone else wants to see if they can get Linuxsampler/SalamanderGrand to play it: http://dl.dropbox.com/u/57410000/pianosong.mid