What about lowering a bit more at the front to get a bit more weight at the front tires
Lowering or raising makes no difference at all to weight distribution. Anyway more weight on the front would increase understeer.
an ARB if you havent got one
Adding a front ARB or making it stiffer will also increase understeer. An ARB makes no difference to static weight distribution, but when cornering an ARB does throw more weight onto the outside tire at the end the ARB is fitted. So that tire has to do more of the work, so has to be turned more sharply to generate enough lateral force, so will be nearer to its limit sooner, at which it just slides. That's understeer.
The only way an ARB will improve handling, is to prevent the suspension deflecting beyond its proper geometric limits. If the geometry goes so crazy at large deflections, that the handling goes to pot, then an ARB preventing that my improve handling overall even if you've worsened it by messing with weight distribution.
Lowered springs will have slightly destroyed the designed suspension geometry, and on cornering the suspension will deflect even closer to its geometric limits.
To reduce understeer:
Reduce front roll stiffness - weaken the front ARB and/or weaken the front springs.
Alter weight distribution - give the front tyres less of the work to do, by moving heavy things like battery to the rear.
Increase roll stiffness by same %age to both front and rear, to keep suspension deflection within its proper geometric limits.
Fit crap tyres to the rear, so front grips more than rear (only joking).
Overhaul all the suspension and steering bushes, so the geometry works as designed.
