You're in a very similar place to me. I've been powerlifting for about the same time and my max is around 115 kg in meet, 112.5 kg last tested in training (247/252 lbs). I weigh in around 210ish lbs (96-97 kg).
For a consider while my bench just didn't move. At all. Not just my max, but anything over 85% for reps was something I couldn't guarantee I could hit for more than a single. I tried varying grip, setup, different accessory work. Nothing.
Two months ago I got some good technique advice and found my optimal set up. This took a couple of hours with a PL coach. That was step one.
Step two was benching more. I decided that every time I trained, I would bench competition style. On non-bench days this ended up as 3x5 at 75% (this is to get in volume and groove technique); a speed (8x2 at 60%, then 65% next session, then 70% the next against bands or chains) or repetition (3x6-8 at 75% then 80% then 85% each session) day depending on the cycle; and a heavy day (4x3 and 1xAMRAP at 85%, 4x2 and 1xAMRAP at 90%, then 4x1 and 1xAMRAP at 95%). After the first cycle which has the speed day, add 2.5% to the heavy loads and go back to 4x3 and replace speed with repetition. The 3x5 on non bench days goes up to 80%.
I'm in the final stages of the second cycle and I've never been happier benching. Last week I hit 231 lbs for five, a couple of weeks before that 245 lbs for three. I'm also much more confident under the bar for grinds.
The only bench accessories I do are weighted dips and incline presses, and those I only do maybe once a week (so dips one week, incline press the next). Both are in the 6-8 rep range.
I also do a fair bit of rowing but that's for all the lifts and not just bench.
This averages out to benching in some form three times a week. For me it actually means one week benching four times and one week twice, but that's just how I train.