Here's my opinion since I just went through this process this summer. I originally purchased 1.2cttw Kwiat earrings at the Nordstrom sale. I had debated between them and the 1.5cttw for some time. I got the 1.2's home and I just had this feeling that I should have spent the additional money to to get the 1.5's. I took the 1.2's back, purchased the 1.5's and felt they were worth every penny for the size difference. I noticed a HUGE difference in my ears.
I would suggest that you go somewhere that will let you try on a 1.2 and a 1.4. You will know after seeing them in your ears I think.
Congratulations...I wear mine every day!
Oh no... and I'd almost made up my mind to get the smaller ones!