I've had five custom built Suhr Moderns and currently just bought one of those off-the-rack Suhr Modern Satins that I currently sent back to Suhr to have a small issue resolved. I also received a Suhr Custom Standard a little while back that I have not captured pics of yet. I had a similar experience to yours with a mahogany body/neck, maple top that I previously owned that I based off a GG sig. Out of all the Suhrs I owned, it was the "deadest" sounding (just overall duller) and also the only one that had the 10"-14" compound fingerboard radius that I will never go back too (just not for me)....beautiful guitar just the same. One of my favorite body/neck wood combos on a Suhr is an alder body/maple neck. My first Suhr was a Blue Drip Modern that had the alder body/maple neck combo. It sounded fantastic, but as I got other Suhrs with my fave Modern neck carve (.800-.850), it always bothered me a bit that the Blue Drip's neck always seemed thinner in comparison to the others I had, and it dawned on me that at the time it was built, they did not have the .800-.850 carve programmed into their CNC machine....they'd use the .820-.870 and sand it down to around the .800-.850 carve, but it wasn't exact and I could always tell, so I replaced it with a similarly spec'ed Purple Nova Suhr Modern, which I still have. Naturally, it was later programmed into it. My new Blue Drip Suhr Standard also has the alder body/maple neck combo. BTW, all of my alder bodied Suhr have always came with SSH+/SSV pickups, which I personally think are perfect for those woods.
The other two Moderns I've had built were a basswood body/maple top/maple neck and a mahogany body/curly koa top/pau ferro neck and fingerboard. The basswood Modern I owned I still regret to this day for selling. Really, I just wasn't crazy about the SSH+/SSV pickups with it...I now feel that if I would have put some Aldrich pickups in it (or some other brand of pickups), I would've been much happier with it. I just feel like I gave up on it too quickly. The curly koa top Modern I still own and pretty happy with. Even though it has a mahogany body, it sounds very different with the all-pau ferro neck and Aldrich pickups....it is the most "focused" Suhr I've ever owned. Great for leads and very tight, but maybe not as versatile as my alder bodied Suhrs. Now, the Suhr Modern "Satin" is a whole different animal to the GG-speced mahogany Modern I owned in the past, which I suppose is due to it having an African mahogany body/neck as opposed to the Honduras mahogany. It is the LIGHTEST guitar I have ever owned! I've only played it a week before sending it back to them, but everytime I'd take it out of the case, it was almost laughable....just stupid light, compared to my other Suhrs. And, while it's not as bright as my other Suhrs, it's not really dark either. You can really get some nice chucky rhythm tones out of it. I was really on the fence about purchasing it online, but they had a return policy and so I took a chance and I'm glad I did. Different from my other Suhrs, but in a good way.
As far as other options that I like on my Suhr Moderns....I really like a fairly flat, straight fingerboard radius. Two of my moderns have a 16" radius and the Satin has a 14" radius. Anywhere between 14"-16" is good for me. My fave fingerboard wood is Indian Rosewood, although Pau Ferro is nice as well. Like most, I like Jumbo SS frets. Good call on the roasted maple neck. That is the one thing I wish I would have got on my new Standard and my Purple Nova Modern...not a big deal for me though. I just know John says it does seem to make a small tonal difference. I think you have good specs on your potential build. The only thing I'm not completely convinced with for my taste, are SSH+/SSV pickups with a basswood body/maple neck Modern....maybe it'll work for you though.
Anyways, here are my past and present Suhr Moderns:
