Harley, with the size of a hilt, its a matter of proportion, not measurable height --- well, at least with Bali keris it is, because with Bali keris the size of the wrongko can vary quite a lot, with Jawa keris the sizes and consequently the proportions are very much more disciplined.
I can't be certain if the hilt is a whisker too long or not, because a very slight difference in the angle of the photo can make a difference in the perceived proportion. I wouldn't alter the proportion, were I you, its within acceptable parameters.
Do you have any images of a cenangan that you can copy? What you have produced is already very close.
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