You can adjust the ride height at the rear. When I changed to 300lb front springs the rears were changed to 175lb linear springs. New one way adjustable dampers too.
Change to stiffer springs. 55mm without your weight is way too low. My SV was fitted with 170lb springs and I changed to 250, then 300 👍 the spring is much longer too.
I changed my front springs, initially to 250lb then up to 300lb. Smooths out the bumps and helps keep the sump off the ground. Check any ride heights with the equivalent of your weight in the car.
I suffered two failed hydraulic slave cylinders before ditching the hydraulic system and fitting a clutch cable. No other parts required. Took about 20 minutes. So much nicer to use and easy to carry a spare cable.