Regarding your home game, please post the Sng structure so you can get some sensible advice.

My feeling from your post is that you play very basic poker - waiting for good hands and not bluffing, and you play vs players who know how to take advantage of it.

Tight image means that your bets are respected, that is good.

Early on play very tight, and play any hand you play agressively. Raise any hand you decide to play preflop, c-bet a lot.
Once you are down to 4-5 players raise the level of aggression, bluff at pots, steal blinds, and try to do it without giving any visible tells.