pH of 7 is just fine...I kept mine around 8, so I would definitely not worry about lowering it.
They do seem to appreciate higher temps though. Most recommend 82ish, although mine seemed fine even if temps dipped closer to 80F.
When it comes to blue rams, I highly suggest doing some digging before purchasing. Stock from run-of-the-mill LFS is not always the best, and of course, big box stores have an even worse reputation. Finding a local breeder would be the absolute best option IMO. Quality stock will get you a long way when it comes to keeping blues successfully. My guess is that most problems with these fish stem from getting horrendous stock, which is why they have such a name for being picky fish. In reality, they really aren't different from other fish...clean water is always better!
Another thing to consider is what type of group you are going to keep them in...the ram experts claim they are harem breeders (multiple females per male) although it seems very few hobbyists keep them that way. Most opt for pairs, but that wont always work out. I purchased my "pair" as such, but since they were juveniles they weren't a proven pair yet. The male decided it was time to breed before the female was ready and subsequently harassed her to death. So keep in mind that the pair method isn't always the best way to stock rams. Others will then say to buy a group of 5-6 juvies, let them pair up, and rehome the rest. Ultimately it may depend on how much space you have.