Hi; I had similar spec General tyres 155/70/12 on my Mehran with stock rims and found amazingly improved performance with road grip and handling. Found absolutely no issues with suspension nor stiff steering. Steering actually was pretty smooth and light (almost like power steering).
Does your rims weigh much more than stock rims? Else, tyres are pretty okay and suggest to have these to improve handling of Mehran and have a safer drive.