Effects of current/voltage limiting of LEDs
You can't control both voltage and current into a load. you control one and the load will dictate the other.  you can set limits on both in which case which ever limit is reached first will cause the load to dictate the other.

when you reduce the current to 350mA the voltage on real LEDs would probably decrease a little.

trying to control LED brightness by varying voltage has not proven to be a good strategy. LED voltage varies with temperature etc.

the best strategy is to vary the current limit and leave the voltage setting high enough to not interfere with current control dimming.

10000A and 9V is a tricky one, but if the leds are magically perfect they will take 700mA when fed 9V, (real LEDs are less predictable, and will probably take several amps, make noise and smoke, and then stop working)

Setting 700mA and 15V should be fine the LEDS will get 700mA and the voltage will stay wherever it needs to be for that to happen (with your perfect LEDs it will stay at 9V, but with real LEDs it's less predictable)

500mA and 7V might  not have enough voltage to light the LED.  you might reach the 7V limit but 0mA flows.