I think Perodua wont simply design a car, it serve a purpose for that kind of high height, yes it might looks ugly because of the height and it has a reason for it...
1. I drive a Myvi and I changed to eibach spring with stock rim and stock abs.
As result the height has lowered and it looks really sweet..
2. As I fetch 2 ppls behind..some bump i need to drive VERY slow over it otherwise kena
3. Comfort wise..more or less similiar to stock but less floating and slightly less bumpy..
4. Higher confident on high speed cornering
5. Especially The Garden carpark, when coming down slope, kena front bumper..
Cannot tahan anymore as very frequent kena the front bumper, So i decide to change to 16" rim
Now my ride looks more cooler but more bumpier compare to stock rim.. Double Confident on cornering.
I have myvi stock spring with me..just keep it for standby just in case of anything..
I think if u change to lowered spring then u cannot fully ultilize what Alza meant to be as a MPV..
U cant load more things or people.. or maybe kena bump..
Keep it as stock i think is the best for comfort, usability and economical way.. and the most important...Peace of mind of voiding warranty...