OK, you are in a box. Texas is NOT UNIQUE in requiring you to take additional college credit if you fail the exam 3 or more times. You obviously have a study skill deficiency. There is no reason to go search for another state to take the exam-- the exam is the same for all of the states-- instead of screwing around trying to find another state in which to take the exam, realign your study skills and really understand the test material.
Take a prep course, put in about 13 hours per week, in addition to 3 Saturday's per month between now and October. Really focus on the test syllabus-- understand what is being tested-- know that information well.
The test is designed to take 6 min or less on each question. Some questions you should be able to answer by inspection-- others may take 8-9 min. You should not have to make more than 5 calculations in order to obtain the correct answer. If you are taking more time than that, you are off track. Go back to home base and begin again.
The PE exam is a bachelor's level exam to ascertain minimal competency of the engineering candidate. We are testing to find the C- student, not the A level student. You graduated from an ABET accredited engineering program, I assume, so you should have adequate preparation in sitting for the exam. You have taken some prep courses, I am not familiar with any of them, but do know that others have had good success with the programs you cite.
You can do this-- buckle down and do it. NO-- you are not dumb, stupid or whatever words you want to use. You can do this. Realign your study habits, get back on the horse and go-- you will be successful.