I did the H/B 190D as well (along with Tamiyas offering). Nice kit.
Hobby Boss seems to be a bit hit-r-miss...as if there is 2-3 different design teams. Some kits have great detail, while others are pretty basic and beg for much more. The only consistancy is that they all (that I have done) have a pretty decent fit and a decent outward appearance. The vast majority, however, all seem to have some accuracy issues...some don't bug me at all, while others really do...which brings us back to the A-7.
Of the 3 different kits I've done...Fujimi/Testors seems to be the most accurate, in terms of size, shape, and capturing the overall look. The Italeri offering was pretty close too. Hobby Boss was best in fit, detail and options...but then there's the shape issues. As is, it looks like the love child of an F-8 and A-7. The fuselage isn't quite tall enough...nose is a bit undersized and not quite as blunt as the real thing...canopy, as you mentioned, a bit wide and not tall enough...and my biggest issue, the intake. It comes off the fuselage just fine, but goes a tad wide and then is too flat across the bottom(hence the F-8 comment). These issues have not stopped me from building 4 of these kits...they also haven't stopped me from adding another 6 to the stash (plus a pair in 48th and Trumpy's 1/32 offering...and 3 of Hasegawas 1/48 kits)
I can look past the shallow fuselage...openning the canopy, kinda helps with the canopy issue. The nose can be sanded a bit to "blunt" it. The intake...well, that takes some work. It wasn't until my 4th H/B kit that I came up with a way to fix it. After gluing the intake parts together, I heated some scrap plastic over a candle, and pressed it over the bottom of the intake. Remove it, trim of excess and CAed it on the intake...repeat with another layer. Sand the edges down, so that there's nothing added to the sides of the intake, it should be tapered down the edge, having all the additional plastic on the bottom. I then sanded down the inside of the intake (mainly the bottom) to round it out and get rid of that flat spot. Having this extra plastic added, it pushes out the fuselage parts, which does leave a gap, but not to worry! I reapeted the "thermo-form/smash molding" process on the outside of the fuselage...a lot of sanding and rescribing is required. I also did the same thing with the intake lip piece. I can't say this gets a 100% mark, but it is a lot closer to accurate than what you start with!
These are H/B kits. The one on the right having "the fix"...the next one will be better!
On the Fujimi kit...I had an issue with the intake fit. There was a pretty big "step" from the intake part to the fuselage, on the port side. I ended up adding a slab of plastic sheet to the intake (after being glued), sanded it down and rescribed.
Here's the finished Fujimi...
All three...Italeri(L), Fukimi(C) and Hobbu Boss(R)