Seeking Help - Need 100pt improvement. Stick with GMAT or take GRE?

Experts,

I am seeking advice on whether I should stick with the GMAT or switch to the GRE. I've posted the summary below of my journey thus far. I am not opposed to trying new methods or shaking things up whichever way I can to boost my score. I am all ears and greatly appreciate any feedback. Thank you in advance.

Studies:
1.) How long have you studied?
I started studying in May 2017. I enrolled in a 6-week online Veritas course and was able to dedicate 1 hour a night and a few hours on the weekends for 3 months. 6 weeks after the course I scheduled a test for August 2017 and scored a 560. Not satisfied, I told myself I would circle back and take the test again once work slowed down.

I didn't touch a book or start studying again until late February 2018. This time I was studying 2 hours a night M-Th and 5 hours Sat/Sun until June 2018. I signed up for target test prep and completed approximately 70% of the coursework. Even though I feel slightly more comfortable with the quant than when I first started, my score has remained stagnant. I studied until late June and am coming off a 2 week break from work/family trips. Right before

2.) What study materials have you used so far?
Veritas Online Prep Course
Target Test Prep
OG 2016 w/ Quant and Verbal supplement (limited number of problems)
Manhanttan SC Guide

3.) How have you scored on EACH of your CATS (including the Quant and Verbal Scaled Scores for EACH)
Veritas Prep #1 Aug 2017 510 Q36 V24
Veritas Prep #2 Aug 2017 540 Q37 V28
Official GMAT Test #1 Aug 2017 560 Q40 V27 (cancelled)
GMAC Test #1 May 2018 530 Q40 V23
GMAC Test #2 May 2018 510 Q35 V25
Veritas Prep #3 June 2018 540 Q40 V25
Veritas Prep #4 June 2018 560 Q34 V33
Official GMAT Test #2 June 2018 370 (don't remember split…was incredibly sick during test, cancelled scores immediately).

Goals
4.) When are you planning to apply to Business Schools?
Ideally I would like to apply R1 but I am willing to push it to R2 if necessary. I understand that most R1 schools have submissions in Sept/Oct so it might be difficult to squeeze another GMAT test with where my scores are hovering.
5.) What schools are you planning to apply to?
If I can score a 680 or above, a few top 15 schools.

Questions
6.) Would it be wise to take the GRE instead?
7.) Do schools see all of your GMAT scores or do they only receive the score you chose to send them?