weaky springs with 2.8 td

Hi,

I'm from overseas (The Netherlands) but driving a RHD Range Rover.
It's a 73 one with a 89 shell. The V8 is replaced by a 2.8 Isuzu td.
Since I've got the car (year ago) I noticed the front springs cannot handle the weight cause when I'm in it, the car will lean to the drivers side.
I replaced the springs several times but still leaning. At the moment I've got defender 110 springs (NRC 8044 and 80450) but still leaning.

Rear springs are HD ones.

Can somebody give me a advise?

best regards,

"Leaning" Ron