First off please do some research before you put out money for parts. Your car is running way rich inbetween shifts because the air is being vented out, this air is measured and the ecu adds the proper fuel. If this air is vented you are left with a overly rich condition. HKS makes a recirc kit for the SSQV for the evo. Or you can get a whole new pipe set up and new BOV but you will also need a good tune with the mods you have. Do you have a fuel pump yet? Get a real UICP or just put the stock one back on and get a decent BOV. look into ETS piping, greddy piping, turboxs, and others. As for the BOV you can do a evo IX BOV, Greddy, Forge, Turbosmart but take the horn off the dual port...... there are a lot of choices for BOV's. Why don't you like the greddy? have you looked into a older discontinued type-s? if your concerned about sound over performance and drivability, There is no advice i can offer except please buy a srt4.......
As for tuning, check out openecu.org and download ecuflash its free, the cable to hook up to your car is $90 and you can completely tune every aspect of the cars ecu. I have seen this used and work perfectly on daily driven over 500whp evos. Mine is currently sitting at just over 400whp using ecuflash. Any good tuner should be able to use this program and if you log using a wideband you can get a near perfect tune. If your in NJ take your car to turbotrix or drive across PA and go to CBRD in York, that would be my first stop!
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Let us know how it works out for you until then please do not keep revving it and going into boost, you could cause yourself major problems. Also if you want to stay venting the BOV either one of these tuners may be able to reflash you for it.