Thanks for the awesome input Stefaan

With this kind of input, you need to come visit this section more often
I unfortunately don't have the actual photo's from which these profiles were made, but am using the photos from the following books:
The SAAF at War 1940-1984 by JS Bouwer & MN Louw
The Spitfire in SAAF Service by Steven McLean
Squadrons of the SAAF 1920-2005 by Steven McLean
Supermarine Spitfire Mk.I to XVI in RAF, SAAF, RAAF, RNZAF, RCAF & Foreign Service by Osprey Publishing.
Armed with your info I have re-checked the scans & corrected the profile of AX-N below to include the red wingtips.

Source: The Spitfire in SAAF Service by Steven McLean pg26Looking at the other scans, I can not see evidence of the other markings you mention.

Source: The Spitfire in SAAF Service by Steven McLean pg73
Source: Supermarine Spitfire Mk.I to XVI in RAF, SAAF, RAAF, RNZAF, RCAF & Foreign Service by Osprey Publishing.
Source: The SAAF at War 1940-1984 by JS Bouwer & MN Louw
Source: The SAAF at War 1940-1984 by JS Bouwer & MN Louw pg105Wingtip colour on this 4 sqdn spit ? hmm

Source: The Spitfire in SAAF Service by Steven McLean pg54lowres, black & white scans .. do not help either
Thanks again for the attention to detail Stefaan, I appreciate the input as I do aim to make these profiles as realistic & accurate as possible.
Cheers