There's been about 6 engineers out, none of them have commented. It could possibly be a factor though could it be causing high latency?
The advice here was to change your ISP in order to solve the latency problem. You've now migrated to Acquiss and still you have a latency problem - although moving from BT Broadband was a wise move !!
Anything that increases propagation and transmission delays will mean higher latency.
You've now appeared to have eliminated most causes - so changing the orange wire for a white wire, from your JB to the master socket, may be the solution - it certainly won't harm the situation.
Your original question was : "can I get interleaving turned off?" Have Acquiss done this for you?
Wagstaff
"Time is a great teacher, but unfortunately it kills all its pupils"