i feel u dude. im naturally a fast speaker and i realised that im 100% fluent only if i were to speak slower than usual. sometimes ill speak slowly on purpose to be fluent if im doing a presentation or something but it makes me feel weird and scared at the fact that i might look awkward/stupid speaking slowly. and to answer ur question, it really depends on the situation itself. because if ur at an important meeting or talking to important people, its better if u speak slowly so that u will be able to convey ur ideas efficiently. on the other hand, if ur speaking to friends (preferably those who knows about ur stutter), then i think its fine if u speak at ur natural pace!