I believe even with OPT it takes up to 90 days. If you applied for I-765 with your AOS your OPT would be denied from I heard. I would suggest waiting for I-765 since it's free with your AOS package, while OPT costs $300+
I sent photos and copies of docs with each form as required. Wouldn't hurt...and the check should go with the package yes.
My case is nearly similar to you. I called them about should I file both at same time. That representative told me that, filing i765 with i485 will do the job. No need to file OPT as final result will be GC EAD. So I have not filed opt. Just give a call and conform about it.
Set each and every form with require documents separately, to make their job easy. Give cover letter or document lists to each form. Send in bunch using big band or clip it forms separately. Provide them updated copy documents as given in form's instruction. Thats the best way to avoid RFE.
Keep "Check" on top of the related form, clipped with first page. Same with the passport pictures.
Best of luck
