Concert Low-G Regular Nylgut : Nice sound but not the best intonation

I have a tried a few low-G ukulele sets for my concert ukulele, to find the perfect one.

This set has a very nice smooth sound, however the intonation is getting worse the higher I fret the strings. I thought it's my ukulele's fault, but with the 'New Nylgut' strings the intonation is much better even in higher positions.

To be totally precise: the C strings intonation is better from this pack, but the E and A strings are better in the 'new nylgut' pack. I don't see much difference in low G strings.

So for me the best combination is to use the C string from this, and the rest of the strings from the 'new nylgut' pack.

I will probably not buy 2 sets of strings just to use one from this set, so I will stick to the 'new nylgut'.

I would think it depends on the instrument as well, so maybe it works differently for other people.