Thanks , yes i had a chat with Tony about this kind of bet,
what i did was 1st week 5ver trixie =100 ....2nd week 10ner trixie = 200. and this week 20 trixie = 283...So the rule i set myself was 3 double stakes
However next week it's back to a 5ver trixie and only double stake with a win, stop after 3 winning weeks and back to start...So far it's working