Take the longest subs you can before trailing appears. Let the sensor grab as many photons as it can.
The only reason to take really short subs is if you are going to layer them over your final image eg building an image of M42 and you wish to keep detail in the Trapezium.
Keep at it. Take another 80 subs tonight and add them into the mix.
Are you taking darks too?? And flats??