currently front running on silverstone M5 (less than 10k km milleage), rear con conti cc5 (50% left)

after changing to this silverstone, noticed this tyre cant much support the weight of this mpv
when on high speed, tend to sway left/right

looking to change tyres (all 4), need help recommend medium range/price tyre suitable for mpv of this weight

size 195/60/15 or 205/60/15

if possible, pls advice the overall review in brief and the est price

no 1 want to help out ?

additional info, the car weighs around 1.4-1.5 tonne