Chris - a story you might find interesting…
Tyler this past April pulled 777 sumo and missed 804 USPF in WV. He hasn’t pulled conventional in over 7 years. The first month after a meet we usually try some different movements we aren’t used to doing just to break it up before we start the bulk of our training.
Tyler decides to pull conventional and pulls 725 raw single very easy. Next week 750 and then a fast 765, I told him I think you might have opened up a can of worms. Just last week he pulled 805 with straps and a deadlift suit with the bulk of his training being in briefs or raw pulling 5s and 3s in the 7+ range.
The conclusion I came to wasn’t so much that the sumo helped the conventional as it was giving his back a 7 year break from conventional. He squats a grand so he already has a strong back. Now pulling conventional you’re able to get your back into it which leads to pulling more weight if you can get yourself in position to pull it.
I guess what I’m saying is maybe its take a break from one or the other might be as much a benefit rather than one helping the other. I believe after this Dec meet I might start pulling sumo just to give my low back a rest and get the legs/hips stronger before going back to it.