That's interesting Amuk. 
 
Are you able to name the source for this information? 
 
In fact, Mpu Djeno compiled a pakem according to his understanding, and in that he lists 3 slightly curved keris:-  
 
Dhapur Pamungkas, which has about as much curve as a Bugis blade 
Dhapur Damarmurup, which has a pretty decent sort of smooth curve 
DhapurDamarmuruptuding, which has a lopsided kind of curve. 
 
In fact, the ricikan that you have listed for Dhapur Jambiyo are precisely the same as for the general understanding of Tilam Sari.
		 
		
		
		
		
		
		
		
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