Hi honeymoonk, and welcome to the forum.
I would like to suggest a different itinerary, just to give some options if a lot of accommodation is already booked. My suggestion is to stay at just 3 camps, as packing and unpacking every day or two is not the most romantic option.
I would start at Lower Sabie and get one of the recently refurbished riverside bungalows (codes BD2U or BD3U I think). Game densities are very high around here with a good chance of the big five – lion and leopard are often seen around camp, especially on the sunset drive, and on the roads south toward Crocodile Bridge and north towards Tshokwane you are sure to see plenty of rhino. There is a lovely deck overlooking the river with a cafe, and a restaurant if you want to dine in the evening. A great introduction to Kruger.
My next suggestion is Talamati, as it is bush camp and has a lovely quiet atmosphere and also a hide overlooking a waterhole which is partly lit at night. When we stayed there elephant, rhino and lions were seen at the water after dark and lots of grazing animals including sable antelope in the day time. As a bush camp you will need to take all your food there with you as do not sell anything other than firewood (and possibly ice).
Thirdly, and to get further north as you wanted, I would suggest either Letaba (for the wonderful river frontage and old trees) or Olifants for the fabulous views. There are getout points on the high water bridges over the Olifants and Letaba rivers, and many interesting drives which will give you a feel for the mopaneveld or the open grasslands. The BBD2V units at Olifants have amazing views. At Letaba there are many perimeter bungalows available and some newly renovated units (but not perimeter) in circle E (BD3, but you will need to request that circle in advance). From here you could leave the park via the Phalaborwa gate if that fits with your other plans.
Whatever you decide you will have a fantastic and unforgettable experience.