Agreed, rentability is better @700w, but it depends if you pay for electricity and if it's cheap or not, sadly for me it's expensive, so just like you i mine @50% tdp ^^
yeah if i had 5 cent electricity i would go with 2500+ sol 1000watt, as it will earn you more in the long term but it's not the case for me either
There is one reason why I moved last summer to The Land Of Very Very Cheap Electric.