Don't doing all this stuff while speaking, see speaking is normal process that's why keep them normal.. Start practicing breathing support from diaphragm and it's life 1:time process it's help to your overall lifestyle and it's main core rule of speaking fluently. 2.go and learn cavity/resonance/pronounciation vowels and consonant process and famous stammering peoples who defeated stammering successfully. 3.don't give up, and don't experiment any kind of speaking technique in front of new people's without practing, always use trial and eroor process (Personally, I think that someone who stutters tries to forcefully expel air from their oral cavity and attempts to speak using only their oral cavity. If they were to use their diaphragmatic breathing support and head & chest cavity while speaking, their stuttering would be significantly reduced. It's my personal opinion)