It is so fantastic to see this! Congratulations Enzo!
Despite already being a great effort I'm sure this will stay with you a long time and mature. These things are life long tasks. - And as someone currently working on one of these beasts I can certainly appreciate the huge amount effort that must have been poored into this already.
And as has been said, the "polishing" part will come together over time.
I suspect that the leeway for interpretation is necessary - These 2 rach concertos that you mention, I rather see them as some of the most passionate pieces there are to play, and that is part of the difficulty. The balance between how much raw emotion can be expressed through their notes while trying to manage the extreme technical challenges also. They must be known so inside out technically, so as to truly be able to feel their emotion while performing... The moral of that tangent being that you can't really (or perhaps just shouldn't) box a pianist into a certain interpretation here. It just has to be how Enzo feels it. You can not force someone to feel something they do not.
He told me he could not match the speed and virtuosity of how Yuja Wang or Langlang played this
I don't necessarily think you should emulate them.. but the skill required, that is, the ability to perform as fluently with speed and flair through passages of immense technical difficulty.. - as above (I have no doubt enzo has it in him - it has certainly been demonstrated previously), it will just take some more time.. more so than work even (though there will certainly be work), just the time to let the piece really settle in.. Its a pain having to be so patient

however enzo has surely already experienced the improvements a work can see when revisted some time later.
I bet you enjoyed playing with the orchestra!