well, every 1.4 & 1.6 i've seen haven't needed injectors recoded even when replaced, and tbh all you've done is replaced seals, why would this require a laptop? it doesn't.

you said in your first message you never touched the tip except with a clean rag, so you've probably dislodged a tiny particle of carbon which has blocked a hole, the holes in these injectors are about the size of a bit of hair.

problem two is you've been cracking off the metel pipes to bleed the system, the reason EVERY manufacturer advises replacing these pipes EVERY time they are removed is to prevent metel swarf from the threads entering the system.

i'd suggest it just needs bleeding, buy a hand primer kit and bleed it all up, once you have nice clean fuel comming out the filter crank it over until it goes.

did you clean the injector seal seats in the head? loss of power after replacing injector seals will be one of two things, you've got dirt in the tip which distorts the spray pattern, poor running, loss of power etc. the other dirty seal seat in the head meaning you still don't get a tight seal.