Hi Gerrym,
"The issue that i have is that there seems to be a high pitched "annoying" sound when i play the Takamine through the Tome match."
Can you describe this sound in any other way. Is it feedback? Is it something else? Any information you can give may be of help here. For me the worst high pitched sound would be feedback and there is generally something that one can do to help to combat this.
"Do you know the best setting for the Tone Match and my guitar. I currently use the Steel String w/piezo."
For me, there's no universal "best setting". EQ'ing is a very personal thing. Tastes differ. Take 10 FOH - engineers and let them EQ the same instrument. You'll probably find that you have 10 different EQ settings, all of which work but may not all be to your taste. It's personal preference. Maybe the "Steel String w/piezo." doesn't give you the EQ sound that you'd like.
"Do yo know if Bose has updated presets that i can download to better suit the sound of my guitar?"
As far as I know, Bose hasn't updated the preset list for many years. If I'm wrong here maybe someone can correct me. In one guitar I use I have an LR-Baggs Anthem pick-up. I've been using this pick-up since it was released about 10 years ago. There wasn't a preset back then, and as far as I know this hasn't changed. I have, however, always managed to find a preset which I can get to work for me. Sometimes with a bit of tweaking. I have one or two settings which I've saved as scenes and can try out if I have problems with one particular preset at a certain location.
"Can i use any of the presets to improve sound of my guitar?"
You most certainly can. In fact it's what I would suggest to anyone looking for a sound that works and is pleasing to the ear. A preset is basically only an EQ setting which has been saved so that a user (like yourself) can recall and use it.
I would urge you to try out different presets (no tweaking, just to see if you can find something which is along the lines of what you're looking for). Record the sound and make a note of the preset's name (e.g. by saying the preset's name on the recording before/after you try it). Try out many of the presets. Don't bother about the name. You may find a preset for an instrument which is nothing likes yours, but which you like the sound of. There's an old saying "All's fair in live and war". This is also true for EQ'ing. What works is OK.
Once you've found something along the lines of what you're looking for you can start to tweak the sound to see if you can "improve" it to fit your preference.
"I noticed a Flat, A, Guitar zEQ preset. Could that help with the problem? "
This preset is one of my favourites for Acoustic guitar. Plenty of scope for tweaking and in the frequency range of an Acoustic guitar. It's become my go to preset when using a T1 tonematch.
"Please help possible. I absolutely love the sound of my guitar over the Bose aside from that faint high shrill noise."
You could try the para-EQ to see if you can find the frequency of "that faint high shrill noise." The easiest way to do this would be to boost the signal and sweep through the frequencies until you find that the shrill noise becomes louder, and then reduce the gain at that frequency.
For help with all of the portable PA's and mixers I would suggest that you visit the Wiki which ST - Pro brought to life for us many years ago. There's lots of useful and interesting information to be found there.
Bose Wiki
I hope that this has been of some help.
Take care in these difficult times.
Tony