Matched Book % [TCKT01062013MTBK]

I want to trickle back bets from 2mins before the off up to a matched bet book %.
Using an Excel sheet I may have 8 selections marked as possible bets that total 87%.

My formula for the trickle bet is
Minutes before the Off is less than 2 - (sel_order*0.833)
thus the lowest ranked selections will be submitted first.

My last conditions needs to check the matched book %
Thus I was thinking
matched_b_book is less than 70 but this will total all my matching selections not bets that have been 'matched' on BetFair.

Is there a variable I have missed that will sum my 'bet matched' book %?

Otherwise I thought a user variable that will sum all bets are lodged.
set mmbpct to zero each race
mmbpct = 1/bm_backp + mmbpct

Any suggestions?
  

http://community.welldonesoft.com/triggered-betting-10/trigger-help-book-value-of-matched-bets/msg17603/#msg17603

Maybe this is what I need.
But will this sum matching selections or actual matched bets?

I think this is what you mean?

condition "and Selection's Trigger Expression match_b_book is equal or less than 70"

No, that's not it unfortunately.
I have been trying things for the last hour match_b_book but that only seems to sum  'matching selections' not ones that have been matched on BetFair 

Here's my test trigger if anyone wants to help ....McBee

I used a condition block from Oxa's Dutch chaser

I did get it operating correcting by adjusting Oxa's Dutch-Chaser.
However some fine tuning as it seems to operate ok and then while reporting say 79% and stopping any further bets, it reports 0 and let's the rest of the best through.
 

hi
i have altered your trigger and tested.
i have it set to 75.00 , but it does go above due to not knowing what the next price will be.

mcbee