no, springs will b fine, its the dampers that are the prob. my ride was similar lowered 40 on p1 springs. rear springs then collapsed.
so i got a full fk automotive kit, and i kept my p1 springs on the front.

so my car is lowered on p1 front springs and fk rear, with fk shocks all round.

after fitting shocks the rige was totally transformed!!!!!

ps they prob drop more than stated cos the dampers may b weak/worn, like my rear ones were

change ya springs mate! get 40mm springs
1 if the wheels are catching on the arch then new shocks will help! adjustable ones like koni! but if you are catching the bottom of th car on the humps then just raise the car or avoid the humps

Got a b corsa with standard dampers lowered 50mm with omp springs (actually they drop more tahn 50mm)
Cornering is great but in irregular ways it sucks and in scrubs a lot in speedbumps.
will a set of uprated shox help?
What can i do to keep this springs and give my car a lil more height?