Your problem is your rate of speech is too high. This is a major issue with many of us due to mother tongue influence. To acheive a moderate rate of speech, I suggest you to get a feel for speaking at the ideal speech rate(110-140 Words per minute) and then gradually reduce it to 80-90 words per minute.
I would suggest you to practice reading a 200 word passage. If you complete the reading in less then 80 seconds, you are speking too rapidly.
Record your Rate of speech and make sure the rate of speech 2 is less than the earlier rate of spech and so on....I am sure this would help
