the medical insurance is no longer requt. Both my friend and I (at different times) have recently entered Thailand, we both have insurance, but we weren't asked at any point to show it
You need to keep a balance of at LEAST 400k all year round and 3 months before renewing you need to make it back up to 800k, in between you can spend it how you like. Better still get a year multiple entry and then there is no monetary requirements and just do a border hop every 3 months.