Retired couple wishing to spend more time in owned USA property [closed]

We are UK citizens who have property in USA. We have always visited three times a year for two weeks each time. We have now retired and can spend longer in USA but have no wish to stay permanently. We booked flights for 80 days in January, February and March then 85 days in September, October, November this year and hoped to repeat that pattern next year. We were held at border control in January as we had been for our usual three trips last year but were soon told that we were fine for this trip but we are now anxious about our next one. We believed that we had stuck to the rules of two trips per year of 90 days or less. Will we be okay for September? Can anyone give the exact ruling on what is possible?