Zikr & Dua

Reciting duas with tajweed

Q: I have a question regarding duas and supplications from the Sunnah. In the Quran, there are signs of stopping or continuing on a certain verse and the reader has a choice of either pausing or continuing reading. My question is does this also apply for the duas which we read. For example like the dua after leaving the toilet is ghufranaka, can it also be said as ghufranak? Meaning do duas also have signs of pausing/continuing? For example the third kalima is Subhanallahi walhamdulillahi, wa laa ilaha illallahu Wallahu Akbar wa laa hawla wa laa quwwata illa billahil aliyyil Azeem. When you recite can you continue by saying Wallahu akbaru instead of stopping and saying Akbar? And can you also say it as Subhanallah instead of Subhanallahi, and walhamdulillah instead of walhamdulillahi, without the i at the end? And can this be done with other duas also?

Congregational zikr

Q: In my local Musjid sometimes after magrib salaah they do mehfil zikr for about 5-10 minutes. They would start off by turning off the lights and we would sit on the floor and have a main person who guides us through the zikr. Throughout the zikr I heard things or words that I have never heard of such as 'Haqhu' and 'Jalashanoo' they would say it in quite an aggressive way which gave me doubts regarding the zikr that had been taking place. My question is:

1. Is this whole gathering permissible?

2. The words used in the aggressive manner 'Haqhu and Jalashanoo' , can they be used?

3. What is Imam Abu Hanifas opinion regarding mehfil zikr?