Finding a medical insurer

We applied for private medical insurance with DKV and it is a waste of time. 

I was totally truthful with the forms. 
I explained about an operation I had 5 years ago to remove a blood clot on the lungs and even provided a letter from the hospital stating I was signed off needing no further treatment because the operation was successful. 

I put down my wife’s hysterectomy 20 years ago and a thyroid problem she has now and takes tablets for. 
They have asked for pathology reports for that and a complete history or what caused the blood clots in my case. 
absolutely ridiculous as I’ve already given a letter signing me off and I can get info for wife for something she had 20 years ago. 
I'm wondering wether I should not put anything like that in applications in future. There’s seems to be little point in being honest. 
does anyone know an insurer that’s more straightforward than DKV ?

It seems they only want perfect people that have never had anything wrong with them