Handling problem/ advice!

Ever since having my wishbone bushes replaced with poly ones the handling seems off!

I had 4wa done which made it worse when i went in the steering wheel was slighty off centre they adjusted it so the wheel was dead centre so running zero toe up front.

It was so bad that i had no front end grip at all with the low on tread conti's so put the new falkens 452's on the front this was a big improvement but still not like it was before!

Now im stumped to why this would be? But im starting to think that i should add some toe out, the car runs straight and true and is great on the motorway, but cornering is iffy, sometime's it feels like it understeers (have adjustable rear arb softest setting at mo) and is sensitive to camber change.

Factory spes for toe left and right are -0.5 - 0.5

Just need some advice is there something else i can do or missing? Im going to add some toe out but how much? Also going to set my arb to next harder setting, any advice? Thanks.