I'm personally reworking my deadlift. I was lifting way heavier with mixed grip but it was causing muscle imbalances and making my grip strength terrible on my left hand. Now I'm doing neutral grip, my grip strength sucks so I use straps. Basically pulling 3 plates, 5X5 right now excluding warmups.
Unfortunately, I have to stop any heavy pressing/pulling movements because I injured my finger...open gash/wound, really disappointing but it's impossible to grip anything heavy right now. Fortunately, I'm still able to do squats but I'm worried going too heavy because I still need to grip the bar. Hopefully I won't lose too much on my gains as I'm still in the middle of a cut (trying to get from cut->shredded now).
I do sumo, when I was new to the gym like 4 years ago, my hip mobility wasn't the best. You could probably pull more in conventional if you have a good hip drive/mobility. But I wouldn't really recommend testing out sumo unless you are a power lifter and only care about numbers.
Also, the macros on Costco Kirkland Bars are pretty good (190 calories, 21g protein, uses artificial sweeteners to lower the calorie count). Quest bars probably taste way better, but they are expensive as hell. I use it as a snack if I'm too hungry before the gym or afterwards if I want to get something filling as I know I'm going to be hungrier later in the day (cutting).
For about 2-3 months I was going heavy/volume as soon as I woke up and working out fasted, it's easily doable and you can still lift heavy if you don't overdo it (gets easier once you get to your heavy working sets and a bit of a pump going). But it's incredibly mentally taxing, so I had to take a break for now.