I have thought long and hard about retaking the LSAT and waiting a year because I took about a 10pt hit on from my PTs because I was so anxious during the testing.
If I was in your shoes, I would plan to attend the top school to which you are admitted and retake the LSAT in June. If your June LSAT is substantially higher, then you may want to sit out a year and reapply next cycle.
I figured that a 160 LSAT and a 4.0 GPA would place me at a school where I would have a good chance of doing well. And I don't mean guaranteed top 10% but I figured I could at least stay in the top 30% or so. Is this true?
I read this as you thinking that you should have received a 170 and with a 4.0 GPA you will be more likely to perform better than many of your peers at a school where a 160/4.0 enabled you to attend. From almost every source I have read, LSAT/GPA are not very good indicators of individual success in law school, regardless of where you attend.
The 1L I spoke with said top 30% would give one a good chance of landing a job paying $85,000 or more. Does anyone have any real evidence that this is untrue?
30% at a school like Iowa and you probably have a decent chance, but you still have to interview well. The opinion of a 1L may be more meaningful than that from a bunch of 0Ls, but they may not be a very good source for information regarding post graduation employment.