Keep banging on at the SENCO.
Also does your local council have a parent partnership service? They offer lots of advice. We also have a Cheshire Dyslexia group, charoty run, £20 a year, very usefull.
I found through asking other Mums a Mum of an older dyslexic child (who is now 17) and she was brilliant to sit down and talk to about their experiences, I felt very releived after this, and now the boy is Head Boy at his school!
My DS1 was 6.5 when screened at school buy his SENCO, he is 7.5 now and having an assesment for DCD like you DS, in November. He does get 121 help everyday from the TA, specific spellings, longer to do his homework etc.
In the last year I have seen a big change in his ability, others may see it as tiny, but for him its massive. EG: saying T A P using phonics did not make the word tap no matter how hard he tried! But he find the Biff and Kipper books easier as he has learned to recognised the words.
He also learned to ride his bike in the past year which seemed to boost his reading power.
I also agree about sports, he loves playing tag rugby, although his running is all over the show and he also like crazy golf.
I have not done the Dyslexia Action test either because of cost mainly and also he is making good steady progress.
It is hard and I think the school are being particulary unhelpful, but do keep trying. I get very frustrated with it all sometimes but you have to take it slow and find out what works for them.
Confidence is a big issue with my DS, after some teasing and he can see where his classmates are up to etc, so you really must try hard at boosting his confidence, we read aand write silly words, like POO FART etc you know words boys love and he thinks it's hilarious and he loves to write them.
Audio books are great too, Astrosaurs, Horrid Henry - then he feels like he can be part of the playground talk.
Gotta go, kids calling!