Thanks for the replies!
To answer your questions, no nothing needs changing on the guitar, as it plays really well (was actually good to go out of the box, and excellent after a proper setup). But this one is a keeper, so I want to do some improvements to it when I can afford to.
Good news about the tuners, someone left a review on Thomann stating that the Grover 406BCL6 Mini Locking Rotomatic fit perfectly on a Solar A2.6 so they should work fine with the V2.6 as well.
Regarding the nut, from my understanding Black Tusq is better than the simple graphite nut that the V2.6 comes with because it's self-lubricating.
But now I have found something new and I have another question: while looking on Thomann I found a bridge with many good reviews, the TonePros T3BT-B Tune-o-matic. It looks exactly like the bridge I have, and from my measurements it should be the same size. The only difference is that the TonePros bridge has two small holes at the posts, while the one on the V2.6 does not. They state that they use a patented locking technology. What exactly does that mean? I couldn't find a clear answer anywhere on the web.
To understand exactly what I am referring to, look at a pic of the TonePros T3BT-B Tune-o-matic and compare it with a pic of the Gotoh GE103B-T BC TOM-Style Bridge. You'll see the holes that the TonePros has and the Gotoh doesn't (that Gotoh looks exactly like the bridge on the Solar).
Those holes are basically just set screws to lock it to the posts. Not really an improvement IMO, as I’ve never had a TOM move on me and I haven’t noticed any difference in sound via swapping, but it doesn’t hurt anything either.