It's way too close I would use your 62 as the secondary and put an S475 under it, then you'll have a well matched setup with much more power.
Did you miss where he said its laggy? If it spooled fast enough form him then he wouldn't be wanting to put the HX on.You have a 62/65/14. You would do very well to put an s475/96/1.32:S475 under it, you can buy the twin piping needed here:Compound "Twin" Turbo Kits. Now you need better matched injectors that are a better quality than DDP, I'd go with DFI 7x.012's:DFI 7X0.012's SAC 98.5-02 - Ducky Fuel Injection.