I was worried about hothousing until I realized my dd was hothousing ME! I could only take so many "I WANT TO DO MATH!!!" meltdowns before math workbooks became an automatic part of our evening.
We have had the same situation. If doing math will stop the tears every night - then fine, we will do math! We met with a psychologist this weekend that specializes in young gifted children. He told us we should actually be doing more math with him. He explained to me that kids like this find this to be a form of play...and as long as he is having fun don't worry about pushing him. There is no doubt that our DS3 lets us know when he has had enough and then we stop.
