step 1: boil water
step 2: stick one end of the tubing in the water, submerging about 4" of it
step 3: leave it in there for about 30 seconds
step 4: take it out
step 5: put it over the barb you want to put it on, and it should fit easier
This is for putting tubing on an oversized barb, say 1/2" ID tubing over a 3/4" OD barb. But you could apply this same method to boiling it prevent kinks, just boil the part you want to bend in a special way, then bend it how you wish. Hopefully it should become a little more rigid and stay like that, causing less kinks.