It looks like Silverbolt is slightly mistranformed in alt mode compared to the photoshop'ed stock photo. The arms under the wings should be able to bend inwards a bit more sit be parallel to the fuselage. It might help a little bit...

I don't get it. The triple changers made Generations so promising, and then the level of engineering has dropped dramatically. Now we get something like voyager Brainstorm, whose transformation to me is on the same level as the original G1 Brainstorm designed near 30 years ago(who actually hides the face BETTER when in headmaster mode).

It is just the difference between designers? Or is it simply the development time? (Springer apparently had been in development for 2 years.)

The Deluxe Stunticons IMO are better in every mode. In combined mode they don't have individual limbs hanging off everywhere.