>>> I normally get 28-30ms so im up by 8ms - yet my Interleave Depth (96) and INP (1.04) are the same as before so hows this?
It may be something to do with your routing, or even how busy the link is.
Its not just interleaving that can affect latency.
~ One of the hops may be experiencing some congestion.
~ You may be going via a different route, which may take a longer. You have no control over the routing.
Ive known this happen many times in the past for eg when on BTw Ive seen my latency go up from 15ms to 28ms on a non-interleaved line purely down to a re-route of the exchange backhaul.