I dont run the 19's on my D4 when off road so can't offer advice on that issue but with the 18 steel wheels and BFGKO'2 I found 16 front and 18 rear was perfect for the really soft stuff at SA ( Robe, Beachport, Cape Jaffa etc. ). Heaps softer there than anywhere on Fraser.
First trip on sand and I had it bogged to the sills a couple of times and hated it compared to my Disco 1, no feel on what the car was doing and it just didn't handle the soft stuff anywhere near as easily or as well as the older car or how I expected. 
 
4 days later with a bit more practice with the electricery and getting to know the car it was OK and as good if not better than the Disco 1
I guess it all comes down to what tires are on the 19's as well but I would think low 20's would be OK. Just be very careful of the coffee rock when on the beach
				
			 
			
		 
			
				
			
			
				Discovery 1 4.6, true trac front and rear, superior engineering arms,old tourer now bush toy
Discovery 4 3.0 HSE MY13 ECB Bull bar, winch, spot lights, aux fuel tank, Kaymar rear bar, duel wheel carriers, 18 tuff ant wheels 265/65/18 BFG KO2's for play
			
			
		 
	
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