Much appreciation for the hard work done by you and your team.
I understand that many old players would be upset regarding the new set since they spent a lot of effort and donation in getting it. But making the Rondow set similar as Tera set in stats will also upset some players and will make farming and upgrading the new set less entertainment.
I recommend to make the tera set superior in PVE and the Rondow set superior in PVP. This will make players satisfied in having both sets since they are both needed in-game.