There are some very good IPF powerlifters in Edmonton I believe. I'll ask the Calgary IPF guys where they are.
Regarding your deadlift, while I think it is likely that it will improve with practice just by your nervous system improving I don't like the position your lower back defaults to when you start the pull. IMO you are borderline danger zone. Watch yourself at the instant that you begin to pull. You can see the glutes activating while the lower back is still relaxed. You want these to activate at the same time.
If you are concentrating a lot on pushing out your abs into your belt, that could cause reciprocal inhibition in the back. I.E. while your abs/ta/pelvic floor should be tight for the lift make sure to remember your lower back has to be very tight as well at the instant you begin the lift.
Simple muscle activation and better body awareness might help this situation. The key is a lot of repetition to make sure the nervous system is efficient at recruiting these muscles when needed.
1.Practice pelvic floor contractions. To do this imagine you are stopping yourself from urinating. Most people have very poor pelvic floor contractions.
2.Practice transverse abdominus activation. It's tricky, but laying on your back try to contract the very lower part of your abs while keeping the upper abs relaxed. Contract the pelvic floor while you are doing this. Ideally the TA should contract with PF, but it takes work.
3.Practice erector spinae activation by laying on your stomach with a pillow under your pelvis. Try to contract the different muscles of the erector spinae group without moving. When you do this contract the pelvic floor as well.
You can practice these for a few minutes while you are falling asleep. It can give you a big advantage both in nervous system efficiency and being more aware of when things are contracting correctly. Also sometimes it is good to watch yourself in a mirror during a light set to really learn how to contract all of these muscle groups individually. For instance, with light weight while near the bottom portion of the lift let your back round a bit while you are hanging there, then correct it.
Some physiotherapists have ultrasound screens to help you learn how to activate everything correctly by having a visual reference to what is actually going on (it is really hard to do it on your own). However, once you have this awareness it is much easier to know what to do when people say "stop rounding your lower back".