Hi
Firstly you are entitled to a quota of free professionally written trigger requests depending on your subscription, details here:
http://marketfeederpro.com/learn/triggers/trigger-development-service/I wrote the basic trigger I detailed in your other post and tested it. The race was interesting because it showed what happens if the spread loss trigger fires because the lowest back price has been met, but the horse still gets beaten. You can see the results in the two screenshots.
So I manually laid the favourite pre-off in this race and the trigger did the stoploss automatically in-play.
screenshot 1 shows just after the trigger fired
the horse got beaten and screenshot 2 shows the end result
From this testing I suggest you lower the triggering back price much lower than 1.40, but that is what test mode is for and you can experiment for yourself. You can adjust the triggering price in the constant The third screenshot shows the trigger.
This is a very basic trigger and you should use it to test and develop your own. Please use test mode to try it out. If you move to real mode, please note that in-play prices move very quickly, especially towards the price range you are looking to trigger at and you may not get matched. Please use only small stakes for testing in real mode.