how do i fix the idle dropping too low?

so i own a 1999 Zetec 1.6v Ford Focus hatchback 5door

but it had a low idle issue wich i have mostly resolved by remove the idle
control valve & the Gas valve housing or whatever you call it and cleaned
that.

the only issue now is that when the engine is warm and you have recently
accelerated the car drops too low in idle making the lights flicker when it
drops too low. but if you keep it in idle for longer it will cool off again and start
running better but my main issue is the lights flicker or anything else
electronic related like if i need my lichts my heater & my wipers when i come
to a stop the idle gets so bad that the wipers lets say barely move and it
feels like the car is about to shut off.. ive cleaned the idle control valve and
the throttle body aswel with carb cleaner/throttlebody cleaner. also added
new small air hoses that were about to go bad. so those things cant be the
issue i added a slightly stronger battery but that also did not solve the issue.
it seems that the engine drops too low and can not give enough power to
electronic devices. HOPE YOU CAN HELP ME!