And South Africa had a huge gap in Tests anyway (corresponding to a time when WI bowlers were most dominant), so not too sure what to make of that. Ultimately all of Australia, India, Pakistan, New Zealand were dodgy as ****, from what I saw. WI probably was as well, if the stats back it up.
Referencing the four mentioned, and this is just from stories I've read or heard. And not saying there weren't others.
Australia, from talking to past test players the issue, especially with Lillee wasn't so much the LBWs, it was uncalled over stepping the front crease, and not by small margins, running down the middle of the pitch on his follow through, he was just allowed to do what ever he wanted.
For India, the first story I heard of was Marshall being brought to tears on his first tour and vowing not to return. There was also the caught behind off Gavaskar that according to the article, everyone heard but the umpire. Imran also used India as his main reason for requesting neutral umpires, as he believe he never got fair decisions over there.
Pakistan, I'll keep this brief. The main two stories that were whispered in the '80s were that Javed couldn't get LBW decisions given against him at home. Then there was Imran and the lack of vigilance with regards to ball safety, and the home LBW issue as well. I know the latter is greatly disputed by Smali, Trundler and ORS but it was something that was discussed. And Pakistan umpiring was also the source of contention on various tours during the era.
New Zealand, especially against us, were the absolute worst. What has to be mentioned though, is that Hadlee's average didn't have any substantive difference between home and away, so that may have to be factored in as well.
Though they weren't mentioned, I know that Pakistani's reference a match where a LBW decisions went against them that cost them the victory what would have won them a series against the WI.
Again, from my perspective and everyone would have their own.