I don't think you're going wrong. But I do think you're stressing too much. As long as you're nursing on demand and your baby's weight gain is normal, there's no reason to think that your child actually needs to eat solids. Until around 1 year of age, breastmilk alone meets a child's nutritional needs, and solids are just for experimenting with new tastes, textures, and motor skills. So while your kid may enjoy the Gerber, he probably doesn't actually need the Gerber, or any solid food.
So, what should you do? I personally would advocate trying a baby-led solids approach (Tons of threads on BLS here, just search!). Instead of driving yourself nuts steaming and purreeing and then spoon-feeding, only to see all your hard work go down the drain, just put some soft, Cheerio-sized solids in front of your baby and let him experiment with getting them into his own mouth. Since your LO's nutritional needs are met by breastmilk alone, it doesn't matter how much he eats- think about it this way: if he eats some solids, great! If he tastes some and spits them out, great! At least he tried. And if he won't eat, and prefers to mush the solids around with his hands, great! He had a good time and learned something new.
My baby is almost 8 months, and for dinner tonight she ate a handful of Cheerios, some Gerber yam puffs (What can I say, I'm lazy!), and some Cheerio-sized pieces of cherries that had been frozen and then defrosted and were very mushy and gum-able. She has also eaten shreds of chicken, eggs (a disaster, for allergy reasons), bits of toast, rice crackers, and tiny pieces of tomato, strawberries, cucumbers, squash, sweet potato, bananas, peaches, noodles, and has sucked on peeled apple quarters. It's been fun!
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"