individual method of contact? Some prefer email, others text or phone call, still others through P411, etc. I am not sure if using TER Pm system is a great way to go.

Also, you didn't indicate any references in any of the examples you listed nor did you say anything about yourself. Your requests were not incall or outcall specific either.

Good luck.

you are not getting any responses from ter pm.
Is to look on their profile and see if they have a website and email listed.
Either fill out the screening form on her website including your info along with your ter handle and any other appt details.
If you are not comfortable filling out a form on her website see the email listed on her website and profile here and email her the info.In some cities TER is not the main site used so perhaps some providers are not checking their pm's from here.
Also look at her ads and/or website for screening requirements.Some providers will see you with whitelists and there are many that are going to want to know your info along with your handle and whitelist.
Below is just an example of an email you can send to a provider for an appt request.

Hello XXX,
My name is (Insert name not ter handle here)I am very interested in setting an appointment with you.
I have looked at your website and/or ad and I see you are located in (city state)
You could include a little about yourself(very short bio)
I am interested in setting up an appointment for the date or dates ofIf you are flexible on dates state that if you know already a certain day and time mention that as well)
Length of appt
Provide necessary screening info in regards to what is on her website or ad.
Please let me know if you are available on the above date or dates and time.
Also please let me know if you need any additional information from me.
Thank you for your time and I look forward to hearing from you.
Have a great day,

Good luck to you I hope it works out for you:

will send the PM so that the lady can see my review history/whitelist verifications and presumably use this as a method of screening. I also send an E-mail (with my TER handle included ) as a back-up because there are many times a lady will not have access to or log into TER at a particular point in time.  

In most cases, I'll receive an appropriate response back via one of the two mechanisms.  

The content of your PM's is fine... I don't see anything alarming/or time wasting which would cause concern for a particular lady.  However, I think you can leave out the flattering stuff (wonderful reviews/pictures, etc.). The introductory contact is strictly bottom line business. You need to make a strong first impression. There is plenty of time in private to glow/gush about the ladies attributes.  Just introduce yourself and state specifically when you want to see her. Tell her she can use your whitelist referrals for screening (if that is what you prefer) or that you have available references upon request.

except for gals who are regular posters on TER, most gals don't log on to TER very often if at all, so PMs are a poor way to contact her.

Use her email or phone, according to however her site says to contact her

...has expired, the envelope will still be there, but they won't be able to receive PMs.  They may not be ignoring you, they may not be able to read your PM.

As others have said, send an email instead. Also include date, time and length of appointment you're interested in.