The biggest problem in comparing the steroid era to prior eras in which there were conditions that created a drastically different performance environment is that the conditions in past eras affected every player equally. During the pitcher friendly years of 1963-1968 that you cited, all hitters had to deal with high pitcher's mounds. Likewise, during the pre-integration years, all players suffered equally from a limited talent pool.
The steroid era is different because the current conditions don't affect every player equally. There are players that have steadfastly refused to take PED's, thus putting them at a significant disadvantage over those players who do use them. Moreover, PED's have varying effects on those players that actually take them. Ultimately, the conditions today are far more unequal than they were during past eras.
With all that being said, I'm beginning to believe that all of baseball's statistical records are tainted to some degree. Perhaps we shouldn't take any of these records seriously.
To be quite honest, I'm burned out on this topic. I just want to watch and enjoy baseball. At least we can all agree on that.