Rice sowing starting time

When I did my happy hill rice sowing last time in monsoon, happen to learn a lesson about the timing of sowing. Traditionally rice used to be sown by April 14th with first rain. I was thinking this is the best since when sown in first rain, it gets all the advantage of the coming rain, but the issue is that there is a big gap sometimes between rains and land does not hold the moisture well for that duration. So the seeds sometimes does not germinate completely or gets affected in the dry spell which comes after. This is not a real problem for long duration rice seeds, for e.g which takes 5-6 months to mature. They have enough time to grow again. But for short duration crops which takes 90-100 days, 10 days loss can be very detrimental to growth. Fukuoka san's rice crop was 6 months duration so this might have been OK, but Happy hill rice which I have got is 100 days duration and this gets affected badly. So for short duration crops it is better to sow it with rains established well, may be after June 15th or so.