I think your understanding is correct.If your training lasts only 5 month, no matter when it begins, you will get little bursary. And if your training lasts longer but begins from Jan, you will get little bursary in the first L-B year(summer to summer).
I think you will get half load in the first semester, then another half in the second one if your program is more than one and les than 3 terms, no matter when it begins.
Go ask the financial aid officer in the trainning school.