If allowed, ARCA rail as long as possible. use 2 sections so that it extends beyond the end of the stock. If allowed, add as much weight into the forend and beyond as possible.
I use a sticky Gamechanger and can highly recommend it as 1 bag choice - reg fill, reduced to suit your tastes for compaction. Rest your rifle so the front of the trigger guard acts as a brace against the side of the GC. This will greatly improve balance on props... and how much weight you need to add.
Do lots of unsupported positional shooting to complement the practise off the props.
In general, LOPs are too long, combs too high and scopes too low.... when in position, you want your head as upright and as level as possible. For many, you end up with a lower contact with the comb then what is 'fashion'. As you move up and down in height (ladder), your head position relative to the scope should stay stable and comfortable. The body moves and bends but the head/scope stays in the same relationship. This allows the buttstock to move closer to the center of the chest.
If you have a POI change when you move in height, you and the rifle are not lined up properly. If you have to fight to look through the scope in a lower position, you are not setup properly. If you fight to shoot offside, again, you are not set up properly.
Get comfy, then lots and lots of GOOD practise. Focus on hits.. not number of shots fired. Slow is smooth... Smooth is fast.
As you get more comfy with the tasks, the time to get a shot downrange will shorten and you will be able to complete the course of fire. You are scored for hits, not number of shots fired.
Lots to learn, enjoy the journey... watch the winds
Jerry