Sevillian:
I would suggest using KAIO over the Mother`s that was recently applied, then apply, I assume, your newly acquired Souveran wax, since you said you had run out. I also assume that you are doing all of this BY HAND and not with a buffing machine and soft foam pads at low speeds.
I suggest using the Klasse All-In-One because of the chemical cleaners in it and it might (emphasize MIGHT) remove any of the oils of the Mother`s Carnuaba wax you applied, so you have a clean car to apply the Souveran over. I don`t think the Klasse High-Gloss Sealant Glaze is needed, and I am trying to save you an application of product step, BUT you know "the look" your Caddy Eldo should have with the Perfect Shine treatment.
OR try applying Souveran by itself to a test area, like a lower rear quarter panel and inspect it. Does it look THAT much better than nearby areas of the rear quarter panel that have the Mother`s wax you applied?? Again,you know what "the look" of Souveran wax should be like on your Caddy Eldo since you have used it before.
Now what to do with the Mother`s Carnauba wax you bought and I assume have some left over.
I will assume that you use Souveran on the door and trunk jams and under the hood paint.
Could you see yourself using the Mother`s in those areas and saving the Souveran for the visible exterior paint only??
OR, Here`s some uses for re-purposing carnauba waxes no longer being used that I post in another thread about that very question:
(Please do not laugh at some of them; remember I am "a seasoned detailer" with "experience")
1) Snow-blower chutes and lawnmower under-decks to keep snow and wet grass from sticking, respectively.
2) Slide rule inner log linear vernier (AKA, moving stick part) (Don`t ask what a slide rule is unless you are an engineer or mathematician)
3) Kid`s bicycles (Good way to develop relationships with neighborhood young people, plus the bad ones do not egg your house at Halloween or in their later years in High School, at Homecoming time. Just sayin`...)
4) Appliances (especially painted/powder coated refrigerators at holiday time; guests and family are dumbfounded with the shine)
5) Wooden drawer slides or glides
6) Driving in nails or screws in hardwoods (an old woodworker`s and carpenter`s trick)
7) Air conditioner compressor housings or generator enclosures (service tech`s cannot believe what they see)
8) Painted metal doors (especially white painted aluminum screen or outer doors)
9) Wood doors edges that are tight in the frame (like those that swell in summer)
10) Model metal car collections (S100 makes my unboxed 1/24-scale 911 Porsches ready for the holidays)
11) Varnished wood acoustic guitars or colored lacquer electric guitars(Meg`s M16 was actually a preferred wax by some guitar makers)
12) Metal or plastic playground slides (Use caution: taller slides can REALLY send small kids flying if adults are unaware of a "waxed" slide, as the kid becomes a small projectile that the adult may not catch or get knocked over with at the slide end)
13) Toboggan or saucer bottoms (MUCH cheaper than ski wax)
14) Snow shovels for wet snow OR Dirt shovels or spades for clay (Works REALLY well)
15) Linoleum or tile floors for sliding across with wool socks on for the longest-distance slide "competitions" (OK, I did this as a kid and it was HIGHLY dangerous and frowned upon by my parents, not to mention the "difficulty" in removing with ammonia cleaners and elbow grease by said applicator!!)
16) Bathroom porcelain sinks and toilets and fiberglass shower stalls (DO NOT do the toilet seat!! Women will slide off; NOT pretty especially if it is your Mom or significant other)
17) Black leather shoes as an emergency shoe-polish substitute (Patten-leather REALLY likes M16)
As you can see, I have used carnauba waxes for a lot of "non-vehicle" applications, model cars and bikes as the exceptions.