Exchange 2013 issue with High memory Usage on Mailbox server post SP1 update.

Question

So we have been chugging along fine since Feb 2 2014. 
I performed a migration from 2010 from the UK to the US doing "incremental" mailbox moves. (get in contact with me if you want to know how. But we moved 400 Mailboxes averaging at 2gb a piece from the UK to the US, over the transcontinental link.
& then the weekend of the final, had everyone & everything done by the end of the cutover weekend)
Any woot.
So I applied the 2013 SP1 a few weeks back, & have intermitantly been alerted to the memory spiking over 95%. For me (and for any exchange admin) when i get those types of alerts i drop everything & run to the nearest PC to see what is going on.
Now the first & second time, it was an issue with logs filling up the drives, & my clean log script not running to remove any logs older than 30 days. But since then it has been legitimate 95%+ memory usage. 
For the most part its been 95-97 max, with 1 or 2 times hitting 98. After some time, the memory does drop back down to 94.
this is ....umm "fine" however it is becoming a nuisance, since most of the time it corrects itself. What i dont want to happen is get into the groove of saying "ah bah! its nothing" & letting it go.
the server has 16gb of memory in it, it is the Mailbox server (CAS /Frontend is on a seperate server)
below is a screen shot, so i know the Storeworker grabs whatever it feels like grabbing, however it does NOT EVER release memory.  I also see the NodeRunner.exe (2 of them)  is always around 900 almost a MB
now if i could somehow get the first 2 Storeworkers to drop down to 900ish, then that should alleviate my memory issues. 
what I am m looking for is some type of "magic bullet" to put my memory issues at ease..

Answer 1

thats the problem & seems to be a misconception.
Exchange NEVER releases the memory when other things need it.  As the users state in your thread you linked. (i came across that early in my search for a resolution). An example is if another admin & myself log into the backend server at the same
time & begin clicking around opening things, etc..Memory will go to 100% which = No Buenos. 
There are numerous post all over the internet from people who say it releases, but them 5 more comments to that 1 saying that it does not. 
I know what the process's do, however it seems like the SP1 has increased memory usage, as typically the Store.exe would only grab about 900-1000. 
in terms of the noderunner, once again i know its role, however we are now 2 months+ live on 2013 post migration, I do not think it is still indexing all those emails. 
all DB's report healthy.
Name                            Status  CopyQueue ReplayQueue LastInspectedLogTime   ContentIndex
  Length    Length                             State
WBAC1\EXCHBE001                          Mounted         0         0                        
         Healthy
WBAC2\EXCHBE001                          Mounted         0         0                        
         Healthy
WBAC3\EXCHBE001                          Mounted         0         0                        
         Healthy
WBAC4\EXCHBE001                          Mounted         0         0                        
         Healthy
WBAC5\EXCHBE001                          Mounted         0         0                        
         Healthy