The bigger front sway bar made a decent difference and its well recommended.
 
Thats a serious amount of damage, its always good to prevent something than finding a cure for it. Good job on the repairs though, good as new :)

The DeltaV reinforcement plates were very good quality and the instructions, bolts and washers were all included to do the job.
 

I actually managed to install a Whiteline Front Sway bar on backwards loool

I fitted a 20 mm Whiteline front bar, and even on the softest setting it made the steering more positive with quicker turn in.  It also gave the car a slightly firmer ride with slight understeer but this was easy to live with.
 
But later on when the time came to fit new tyres, although I stuck with the stock 225/50R15 rear size I took the opportunity to fit wider 205/50R15’s on the front rather than the stock 195/55R15’s I had previously.
This, together with a bit more front castor made the car balance about nuetral with even better turn in.
 
I believe that the stiffer bar was well worth fitting on the front, but I kept the stock bar on the rear.
The general consensus seems to be that going stiffer on the rear will contribute to more oversteer, something you may not want with your MR2.

look below

That's great news! But ironically wasn't it the stiff suspension and slicks that made Whitchy's SW20 rip it's sway bar mounts?

Mine are cracked apparently. Stock swaybars, stock struts, king springs. I must really throw the car around! Lol.

The pic I showed of chassis cracks happened to a '90 model with stock springs and stock swaybars.
 
Another thing to watch with poly bushes is that they should be a good fit , and not squashed out when the brackets are tightened that can cause mount flexing.
 
Also poly bushes need to be regularly lubed with something like Nulon extreme performance grease.
 

Angle of the dangle.
Most of these problems can be attributed to the angle set between the bar and end links at kerb ride height. When the endlink length is such that the bar ends are horizontal and the angle is close to 90deg, little force is absorbed by the bar mounts and most is absorbed by the bar.
When you lower the ride height, have weak or sagging springs, or over work the suspension to the point of bottoming out, on stock length end links, things change dramatically. As the angle increases, more force is exerted on the bar mounts; in some extreme cases, particularly with adj height coilovers, the bar end to end link angle can reach 180deg and actually invert the direction of rotation, locking solid, hence all the reports of torn strut mounts and cracked bar mounts.
Adjustable end links are good insurance on modified suspensions.