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Its always been alot of weight to put on 2 leafs, then to compound those mini packs aren't helping anything. So yes, they will arch a bit like that. You don't need a new main pack necessarily, but a real leveling kit of long leafs to replace those 4 pieces of plate steel will definitely help it, its ride, and the longevity of the leaf pack.
Has the track bar bracket and the long add-a leafs. The front leaf does not go inverse at rest once these go on, and they're progressive. BUTTTT Summit claims they are out of stock til march. But it gives you a visual of what the kit your looking for should include. Maybe rough country, superlift, or BDS has a leveling kit like this one. Also there is another kit at Summit for diesels (a little more arch in the leafs) it too is backordered to march.
EDIT: Found em. Tuff country makes these kits for Summit. gas is 22961 diesel is 22962. A quick check find gas around 285 for the kit, but I'm sure you can do better. https://www.sdtrucksprings.com/index...4aAkqHEALw_wcB
Stengel Bros is who I order leafs from, they have extra leaf, heavier duty leaf springs also, probably more expensive (~500-600 for a new pair of higher capacity, lift springs) but that's another route to look at. You'll want the track bar drop bracket too, that is around 120.