I was struggling with the other 2 short stack. Us 3 were constantly shoving to steal the blinds. I managed to pull a small lead against the other 2 up to 9bb(was down to 3-4bb previously).

This hand, the BB was sitting out. Guy on my left is pretty tight. Whole table was very tight. No flops seen in the last 20 hands. Did I made the wrong move to shove? or should I have waited for the short stack as he was pretty much getting blinded out? My strategy is that, no matter if I'm the short stack at the table, I'll usually start shoving when I'm dipping below 10 BB even when there are other short stacks in the table coz it would be too hard to play without much chips once the other short stacks get knocked out.

You should download sngwiz for spots like this. Without looking at the numbers personally I would say your shove here is good if the BB is sitting out as you say. You are shoving into the big stack but you have more fold equity than if he was in the BB.

If the BB is in I'm playing very tight here as I expect players at 3.50s to call wider. I think A9+ K10+ 55+ (might be off with this)

In this spot I think 86s is probably the nut bottom of my range.

Hi:

If the BB is Sit out i think the push is border but fine. with the BB sit ou i push something like 22+ Ax+ K2s+ K9o+ Q4s+ Q9o+ J6s+ J9o+ T6s+ T9o 96s+ 86s+ 76s , But be careful with the ranges of push and call in bubble specially in 3.50 the people here is insane.
If the BB is is active i think i push a little tigh something like 20% of the range.

Good day