Janus, my twins are 6.5 months too and eat about 12-14 ice cubes of food between them, plus milk and baby rice mixed in, and then a banan or a bowl of baby rice for dessert! I have also tried BLW but they won't pick anything up yet.
They have just started sleeping through the night again so I just keep shovelling the food in .
They have stuff quite lumpy, I just mash food with the potato masher cos can't be bothered with the blender. They love everything as long as it has sweet potato in it .
I always try to give them a 'balanced' meal, with one third protein (eg fish, lentils or haricot beans) one third complex carbs (sweet potato, brown rice) and one third veg (broccoli, cauli). I sometimes have a bowl of just baby rice on the side to spoon in if they get fed up of the taste of the main meal - like a sorbet .
You don;t necessarily have to make stuff and freeze it. You can boil veg in a bit of water then mash without draining the water so keepign the nutrients. You can mash beans out of a tin (get beans in water with no salt or sugar) and you can bake a sweet potato and use it for a few meals over the next 1-2 days.
All the BLWers are shaking their head at me... I know, I know... I love the idea of BLW, I just can't cope with twins waking in the night through hunger!!
It sounds like you are doing a great job Janus