After reading several of your posts, I've come to the conclusion that you are stressing way too much. Here's my .02 for what it's worth:
1) You're background blows away 'traditional students' - come on - PhD in Chem, patents, papers, etc. and you're worried???
2) I think you're nuts for thinking about the patent bar right now. Personally, I think you should focus on the October LSAT.
3) By all means you should mention your advanced degree in your personal statement, along with patents, papers, etc. My opinion is the PS is your 3 minutes to convince the Admin Office that you belong in LS, that you can handle the load, that you will bring diversity to the student body, yada yada yada. Show you're a leader in your current field to convince them you'll be a leader in law.
4) Three LSAT tests ain't squat - don't judge your score just yet. You've got plenty of time before October. Since I'm so full of it (advice that is) here's more:
A) Buy more real LSAT from LSAC - get the more recent ones as they will trend more towards what you'll see in Oct. IMHO, you should only look at real questions.
B) Work as many sections as you can timed - if you can't spend 2 hours every night, try to work a section a night - that's 35-45 mintues. String a couple together on the weekend.
C) If it makes you feel better, enroll in a course - personally I didn't - but a lot of people do benefit from them. Also, check out a couple books from the library or splurge and actually buy one from Amazon - read the reviews first and you'll get a good idea which one will be for you.
D) Did I mention taking as many tests as you can? Work a couple untimed, you should be able to hit pretty high w/o a problem. Then start timing and get yourself used to the pace, time is the killer, not the question difficulty.
E) Practice, practice, practice, then take time off and ignore anything to do with the LSAT. Come back after a few days and hit it again.
F) Practice with the TV on, the kids around, the dogs barking, phone ringing, etc. Come test day you'll be able to concentrate without a problem.
I think you're just out of practice and need to get used to the critical thinking under time pressure. I mean you're not an idoit who scrapped by with a BS in Basketweaving, so you know you're smart enough to pull a decent LSAT - have a beer man and unwind a bit.
Again, put the Patent Bar on hold if you can - it's too much. A good LSAT will do more for you law school admission than the PB.