Your favorite Electrostatic, Panel spkr

To the OP, most of what I've owned will not work given your room dimensions but here is what I've owned in my own listening studio.
ML Sequels & Sequel II's. Yes I could hear where the crossover was.
Eminent Technology planar magnetic but could not play them loud or the Mylar would hit the magnets.
ML CLS's unbelievable transparency but no low end and could never get a sub to integrate properly.
SoundLab 545's. I ordered them with a custom Birdseye maple frame and REALLY wanted these to be my last speaker since I heard on many occasions their larger versions. But after months of trying with many amps I could not get them to "sing". 
Sanders 10e hybrid electrostatics. One of my favorite of all. Very quick and transparent but requires bi-amping and lots of current. (Yes current which is not the same as power but still requires power). Yes has a narrow sweet spot which does not bother most people and still sounds amazing off axis.
OP: Given your room size the smaller Maggies will most likely work fine.

(Dealer disclaimer)
 

Has anyone experienced Muraudio electrostatic speakers?  if so what was your impression of them?

Small maggies with a nice sub would probably be the way to go. I enjoyed dialing in a sub so I don’t think that’s going to be a big issue most of it is room constraints. I have a home theater that’s 13‘ x 19‘, I may rethink having a set of Maggie’s to put up once in a while and use the existing subs since they are very musical .Does this change anything for any of you guys

the main problem in my HT is my sub array, (2) 15’’s to the left, (2) 15’s to the right of the LP

My room is 12' x 20' and all the speakers I mentioned previously work well in it set up on the short wall about 4 ft. into the room. If you intend to put the speakers in your home theater room you could probably get bigger Maggies and still do just fine.

As for your subs using them with the Maggies would be fine. However, I'm a little confused as to the position of them in the room. What I think I understand is you have 4 subs total, two that are positioned somewhere to the left of the listening position and two somewhere to the right. Perhaps you can be more specific as to their positions. I assume you want to leave them in place for the HT set up. Hopefully the addition of the new speakers will allow that to happen.

If you are convinced you want to put a fairly good sized panel or open baffle into the room, then consider another option of a speaker I have reviewed, the PureAudioProject Trio15 (several variants; I reviewed the Tang Band, Voxativ, and Horn 1 versions). You likely could get by without subs since they have double 15" woofers. In a smallish room that should be sufficient.