Great info!For as long as I can recall, the guys who own Sing have practised 24/7 lighting. There was a time when they experimented with using brighter lights too. My understanding of the way the various farms use WTT is that each farm kind of has their own proprietary systems. There is a lot of overlap between them, but you will find differences too. Not all farms use 24/7.
The premium farms I deal with do not guarantee full helmet GH. The reason is that many customers either lack the skill or determination to keep up the WTT.
Since your fish comes from Sing, and since you want to keep the WTT and are prepared to follow the Sing practise, I think you have already answered your own question as to what you should do.
If you change the WTT process you are currently using, then in my opinion there is a very high chance your fish will lose some of its GH.
Here is a Sing Premium Full Helmet GH that was taken out of WTT when it was around 10-12 inches (that's my understanding). You will note it is at best 40-60% Gold Patches now, not full helmet. The fish is mature at about 20-22 inches size now. It is still a quality fish, but no longer a full helmet.
If I were you I would try and communicate with SING direct via FB and chat with them about your concerns.
I have been talking to Jacklee Chinhan from Sing Arowanas from day 1 and they do the wtt 24/7 and that's what they have suggested.