Getting married the loophole way !

This Site takes you through the Fiance Visa Process, from filing the I-129F to receiving K1 Visa and beyond..hope it helps.

http://www.k1faq.com

You are allowed to visit her wile app penfing.

But be aware that if they deny you entry you will be barred from reentering and you will have to apply for a waiver which will be hard to obtain as you are not married yet.

Keep this in mind as you already encountered problems at a POE.

I did the same thing as you, stayed 90 days, returned and did this 3 times in a row, everytime you get more and more hassle but I was never denied.

Good luck.