Improving Heads up (or: why do i have 4 2nd place cashes in a row?)

[AlphaWice]

I just played 4 SNG's and got 4 2nd places. Last week ive had more 2nd place cashes than 3rd and 1st combined- similarily for all time records.

how do i improve my HU play? Critique these last 2 tourney busting hands:

KJ in BB, 15k on table, hero with 5.4k, SB completes, Hero raise to 1080, villian calls, flop J75, im all in, SB calls with 67, turnriver is 89 i bust

and

A9s in SB, similar stack to above, i complete, BB all in, i call, he shows J3, J spikes


the reason i post these hands above isn't for bad beat story, i honestly dont think i played them that well so i want some advice