List of possible issues:
1. Mixed tyres. You have different grip levels front to back, so it makes progressive driving awkward. You had this before, but you've changed brands again so you're still treading the unknown. What Bridgestone did you have on there before, RE040 or RE050? Massive differences between the two.
2. Tyre pressures. Check them.
3. Tyre sizes. As people have said above, check them.
4. Road conditions. Does this happen in the wet, the dry, or both? Every time round the same corner? You may find you're being a bit heavy footed and not adjusting to the road conditions as we swing from summer to winter.