I think modern LR is MUCH easier then 90's questions. For starters not every flipping stimulus is a novel like they used to be, and they're so absurdly repetitive in structure now. For a goof today I did 10 LR questions today WITHOUT reading the stimulus, literally just the question and answer choices, I considered it a drill in recognizing and eliminating patterns of wrong answer choices. Out of 10 I got 2 wrong. And one was parallel. Even that I ruled down to 2 answers one of which was the correct answer. Not that I recommend this at all, but a 90s LR wouldn't have worked out the same for me.
For the record, don't try that in your prep, it was really just a goof to see if it's as pattern based as i believe it to be lol
I've done that same experiment a few times when bored with time to kill after a new test has been disclosed and got the same results you did.
The modern LSAT test-forms have become remarkably consistent with the typical repeated structures and relationships in all section and question types and typically offered types of incorrect answer choices.
In other words, it's become much more standardized and predictable than it was back in the 90's before LSAC built and started using sophisticated software to design and assemble sections and test forms according to a strict set of item parameters. It makes the test much more learnable IMHO.
And yeah, don't try this goof to prep, you need to already be really familiar with the test and basically have mastered it to a 165+ ability level to be able to do it.