you can go for a PM exhaust, they can fit with spare they are good, excellent in the mid-range, good match with pinasco kit.
They are not too loud but louder than a Sito plus.
they come no painted so be prapaired with heat ressistent spray.
no E- cert
e- cert is mostly noise reduction
it doesn’t fit with spare tire
It is good with a basic tune like the one you have
It is one of the best exhaust for serious tuning
yes the RZ right hand is one of the best exhaust and often said one of my three favourite exhausts.
Taffspeed is the most powerful but not as torque as RZ.
But I have tried them both and the PM too with a Pinasco kit and the RZ is better with this kit but the PM is less louder, I think randz is what you are after. If you don’t like PM with your kit, you will like less the other option for a reason or another: louder, power curve etc.