My typical merge in this instance would be to go between 40 and 60 degrees vertical, roll over, pull hard and loop back down along almost the same path adjusting course with my rudder to get a shot if I have one.
If he took a flat turn or dove on the merge he's probably mine.
If he looped I would follow through the bottom of my move with a full loop with WEP on at least until I got to the top or i would "roll up" in a sort of barrel roll or rolling scissors type of move to regain an altitude advantage while viewing him out the top of my canopy. At this point you have to make judgements as to E state, distance, angles, etc.
If I think I have the distance/angles I would try to move to a pure pursuit position or at least a lead pursuit either with or without WEP depending on what I need but most likely without.
If it looks like he has angles and distance but not E I might roll over and go into a spiraling climb, WEP on hoping to get him hanging on his prop.
If I'm not mistaken the Spit V is both slightly faster and slightly out-climbs a Hurri but the Hurri MAY hold a slight turn advantage. As always, even though the differences are slight they are still exploitable.
The Spit V is also able to continuously loop (a trait shared by most Spitfires) where the Hurri has difficulty and will eventually have to dive or flat turn.
Also, once the fight digresses into a constant turn, while not always recommended, a quick half to full turn with flaps will often put a Spit V into a firing position.
These things are so hard to figure out when your sitting at a desk without actually being there doing it but I think I got down a common scenario.