The refill speed really depends on the weather from end of June to July, last year, the refill during this period is: June 28th-> 72B, July 5th->82B, July 12th->58B, July 19th->41B, July 26th->59B, The Average of the 5 weeks of last year is: 62.4B, if this year the average of refill in the period > 90B, the NG price definitely will come down.
I think June price will probably still wave between $4.3 - $4.8. Don't hold too many short positions over weekend, MM seems always pull up NG price Monday.
EPA has little affect for NG price short term (1-2 years).