Consider what bottrop says when making your soundont .
Also, no useful loop start and end points are specified. it's just tuned from the beginning to the end of the sample, it can be called a repeat, not a loop. I set these.
There is a strange crack in the head of the samples from the recording. I prevented this from being heard with the "sample start offset" setting. In this case, it was necessary to increase the "Vol env attack" part a little more.
I added the relatively corrected soundfont, check it out.