Pls Help Re: Rooted Lollipop & Xposed

I recently had to replace my phone through warranty and so now I'm new to Safestrap.

So please bare with me!

So what I am trying to do is root my phone keep the stock lollipop and put Xposed on but when I flash Xposed my phone gets stuck on AT&T.
The other day I ended up trying something different and yes Xposed work but I was getting gasps and google play not wroking.

Here are my steps for when my phone gets stuck on AT&T ( These are also my notes for me that I keep and follow)

1. Odin through computer and put I337UCUFNB1_Rootable_Full_Odin.
2. Once installed and gone through set up steps, installed Towelroot, and Root Phone.
3. Install Super User. (Sometimes after it disables Knox it requires to reboot or If disabling Knox takes WAY too long get out of app press menu key and close out all apps and clear ram. Re open super su and it will disable Knox and no reboot is required)
4. Install Flash Fire.
5. Flashed - I337_OC3_Stock_DeOdexed_ROM.zip through Flash Fire (Flash Zip or OTA). Once it tries to restart for about 10-20 minutes there will be AT&T logo.
6. Once installed and gone through set up steps again, install Busy Box, Safestrap, & NC1 Flasher.
7. In Safestrap app - clicked on Install Recovery
8. NC1 app - Flashed and reboot.
9. Safestrap loads up.
10. Wipe Factory reset
11. Install ATT_OC3_modules
12. Install I337_Stock_OC3_kernel_recovery_flashable and then reboot. Again AT&T logo sits for about 10 - 20 minutes and I do a battery pull.
13. Install Flash Fire and XposedInstaller_3.0_alpha4.apk
14. Flash xposed-v74-sdk21-arm.zip through Flash Fire.
15. The phone will sit at the AT&T logo for ever. I do a battery pull and still the same thing. Will not Boot up.

I DON’T THINK THIS IS PROCESS IS RIGHT BUT XPOSED DID WORK AND GASPS AND GOOGLE PLAY STOPPED WORKING.
-Note the Colored lines is what I did differently from up above
1. Odin through computer and put I337UCUFNB1_Rootable_Full_Odin.
2. Once installed and gone through set up steps, installed Towelroot, and Root Phone.
3. Install Super User. (Sometimes after it disables Knox it requires to reboot or If disabling Knox takes WAY too long get out of app press menu key and close out all apps and clear ram. Re open super su and it will disable Knox and no reboot is required)
4. Install Flash Fire.
5. Flashed - I337_OC3_Stock_DeOdexed_ROM.zip through Flash Fire (Flash Zip or OTA). Once it tries to restart for about 10-20 minutes there will be AT&T logo.
6. Once installed and gone through set up steps again, install Busy Box, Safestrap, & NC1 Flasher.
7. In Safestrap app - clicked on Install Recovery
8. NC1 app - Flashed and reboot.
9. Safestrap loads up.
10. Wipe Factory reset
11. Install I337_OC3_Stock_DeOdexed_ROM.zip
12. Install ATT_OC3_modules
13. Install I337_Stock_OC3_kernel_recovery_flashable and then reboot. Again AT&T logo sits for about 10 - 20 minutes and I do a battery pull.
14. Install Flash Fire and XposedInstaller_3.0_alpha4.apk
15. Flash xposed-v74-sdk21-arm.zip through Flash Fire.
16. The phone will sit at the AT&T logo for ever. I do a battery pull and still the same thing. Will not Boot up.
17. Battery Pull and go into Recovery Mode.
18. Wipe Clean and then Installed I337_OC3_Stock_DeOdexed_ROM.zip
19. I believe this is the time when it was able to restart the phone. Xposed work but got GASPS and GOOGLE not working.
I have also tried to install Xposed through Safestrap but I believe it didn't work.

I know this is long but I've finally been trying to keeps notes on what and how I've been doing this.

Can someone Please help me with this process?