Dubawi Gold was trained last year by Michael Dods when he was persistently held back by his failure to settle. Joining Hannon Hannon is one reason alone to expect improvement imo, he's won 2 listed races at Lingfield, earning form figures of 107+ and 105+ and timefigures in both races of 105. I'd be very confident, he's an improving horse, but it's also worth noting the strength of his Ascot win as a 2-y-o. He beat Tazahum (now rated 107p after winning the Esher Cup) by three and a half lengths with Group/listed placed Big Audio (103) a further half length away in third.
To take the view that Dubawi Gold hasn't improved at all would mean completely disregarding the fact that the third pulled 11 lengths clear of the 4th. The third he was clear with was of course, Native Khan, winner of the Craven.
Would be interesting to see what speedfigure EC would come up with if he still posts, think it would back up a high view of the form.