Just to play devil's advocate, are you dead set on a Solasfera? Reason I ask is that I personally find that the Solasfera is most beautiful at carat weights above 1 carat. Because of the smaller pinpoint flashes compared to a standard 57 facet round brilliant, at smaller sizes I feel that the Solasfera tends to look rather messy. However, different strokes for different folks, some may prefer the smaller flashes of the Solasfera.
If you are open to considering a normal super ideal round brilliant, you can probably get something a little bigger with the same budget, can consider going down to a VS1 or VS2. The VS1s I saw from Jannpaul are all very very clean. VS2s vary a bit so it depends on what you are willing to tolerate.
Regarding clarity/colour, I'm sure Jannpaul has advised you on what is value for money. It's more or less the universal opinion that G/VS2 is one of the best price points in terms of value, with a bump up to F or VS1 depending on personal preference. Personally, I got a G/VS2 as well. However, it may not always be possible to find a good G/VS2 diamond, simply because the demand is higher and I think they sell out faster. I recall that JP had very few G/VS2 Octagons/Solasferas as well. Easier to find a G/VS2 Round Brilliant because of larger supply.