You weren't measuring the body roll on the car. You were measuring the centrifugal force on the car. Guaranteed. If you got to 45 degrees of tilt, the car would be up on two wheels and you'd either be in the process of rolling over, or you'd be just about to start the process.
If you want to measure body lean, the photos are probably the best way to do it. Either that, or you have to instrument all four shocks and compare their extension or compression at the same time. (Comparing their max or min over the course of a run only shows you total suspension travel, not lean.)
It looks like you've got a fairly typical amount of body lean in that photo above. To flatten it out, you can make the suspension stiffer in at least four ways:
1- Stiffer springs. They will reduce the roll lean and also pitch. They will tend to make the ride harsher.
2- Stiffer shock valving. This will only really affect the lean in transient cases; the car will lean over slower but it will still lean if there are side forces on it for long enough. In some classes, where shocks are "free", this is the way you have to go. The ride will generally get much harsher on imperfect surfaces.
3- Stiffer anti-roll bars. These will link the two wheels at one end of the car together somewhat, making that end of the car resist leaning. The downside is that it places more load on the outside tire, and that can overwhelm the grip there. But you can tune them for oversteer/understeer balance by changing the effective lever lengths from the wheels to the bar on each end.
4- Lower the car. Even if the spring rates and other suspension bits are equal (they just about have to be changed to lower the car) there will be less lean per amount of force because of the shorter "lever arm" between the roll center of the car and the CG. (This assumes the roll center does not move much when the car's CG is lowered. Which is a reasonable assumption for a CRX up to a point.)
When allowed by class rules, usually a mix of all of these is done. The car is lowered using stiffer springs while replacing the shocks with ones valved more for the new spring rates, and stiffer sway bars (anti-roll bars) are added and used to tune the balance of the car.
Other possibilities include using less-grippy tires (they don't stick so there isn't as much side force) or driving around the corner slower. Neither one of which is much fun...