Yes, you should play them definitely more aggressive and you will probably have to open up your range some more compared to 9-handed and with normal speed.
Learn how to play shorthanded games. The thing you need to consider is multitabling them is more difficult compared to multitabling normal full-ring SNGs.
for best results for me is play only with monster cards on first 4 levels , from level 5 you i'll see only 3 or 4 players , after that you play aggressive on position.
I agree, i play very tight thr first few levels, and then i open up with more aggression once the mid levels hit. Havent played too many 6 handed SNGs tho.
I love playing LAG in the right conditions, but when someones raising almost every hand pre flop, you can play relatively tight and throw in a few check raises on the flop. Practice makes perfect