I was in solo mode though?![]()
I tried a Hauler for exploration (no cargo) but got no where due to NPC interdictions and its very limited ability to fight (I actually took down an Eagle!). Enter the same area in a Cobra and interdictions are rarer and easy to win, in an Adder somewhere in the middle. It seems, fairly reasonably that if you are an easier target you will get stopped more often.
In my Vulture in LHS3447 I get no problem at all with interdictions
I generally stay away from the home systems but the only time I have got stopped by a player pirate was near Altair, I lost. So to the OP, you were probably a combination of an easy target and unlucky.