OK, here we go. I have managed to set my rig up and get all but the top tell tale flying now which is a vast improvement. However, I did lengthen my spreaders a while ago as I read that this may be better for heavier crews. Would this be the reason I can never get the top tell tale to fly as it has made the mast too stiff and taken away its dynamic bend, it is a chipstow mast.

I am now going to shorten them for this weekend and see what happens, anyone else have any thoughts on this?

The leech tell tales on your mainsail arte an indication of the air flowing off the sail.
Ergo; a product of leech tension; thus the kicker and mainsheet and traveller are the things not the luff shape, although mast bend can be used to control the leech the otheres are more easily played with, fiddle untill they all flow free, the upper one is the bugger on any main.

Add draft (deepest point of the main) tell tales to mirror the leech ones and set so the windward top one is just starting to lift and the leeward one not drooping. The lower 2 sets should run parallel.
This will assist you more than anything if the luff profile of the man matches the mast.
BFN

Suggest you leave the spreaders alone and make the tell tales longer!