Go to the Bhai Randheer Singh Trust near Siree Darbar Sahib, Amritsar They do santhiya everyday around 12pm. Master Jaswant Singh jee teaches he is a very good paathee with deep knowledge on grammar they only teach from laarvaar which makes it more better, he has being doing this seva for 15 years plus.
Master Jaswant Singh worked closely with Bhai Joginder Singh Talwara and is quite knowledgeable about Gurbani Viyakaran. It would be a great idea to spend some time learning Santhiya from him.