@Stan with TEIN dampers which are designed for lower ride height we experienced opposite: seesaw on OEM springs and in addition to that topping out. The ride height was almost 2" higher. With AD springs travel is about 4.5" on compression. With OEMs it is ~6" with 2” less on rebound. This is spring limited I suspect you see different picture if OEM shocks limit compression stroke.
Also we had installed 3/8” vinyl tubing on middle section, which should have increased ride height by 3/4" and also changed balance point.
With regards to fronts initial impression they are stiffer than stock but not by much. The reduction in body roll you see is likely due to lower height not stiffer spring rate. I will try to make measurements to see how they compare to stocks.
TEIN basis springs are rated 168/118lbs f/r (3/2.1kg). AD rated 175/205. We all know 205 rear is bogus, by loading rear and doing crude estimates they are ~20% stiffer than OEMs and TEIN rears.
We have UR sway bar coming in couple days, and I will have to stiffen front springs because as is it blows on big hits. Unlike OEM TEIN shocks don't have enough damping on impact and need stiffer spring rates I will see what can be done there.
If I were doing this again on the budget, and as namco pointed out it is hard to justify anything expensive for this car, I would put AD springs, do tubing on rears, replace rear shocks and then look for cheaper rear sway bar. Put better tires and camber bolts.
$70 for springs, $5 for vinyl tubing, $80 for pair of shocks, $12 for camber kit. RT-43s are ~$60ea, the only expensive part is the sway bar..
View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)