Too late to post my view on your first chart tech, I would have bought on the most recent bar though, with a stop below the previous test bar.
As for determining if high volume up bars are bullish/bearish. I tend to draw in a line on the close of that bar and use that as my reference point. Below it with increased selling and I'll short any no demands. Above it with increased buying and I'll buy any test or shakeout. Works really well on futs 1m chart.
Not a bad day on the SPI today, I had to wait for my set-up cause I missed the first few hours. But this came along and I was looking for some quick points on longs for sure.
Two bars on big volume, I marked each bar's close and that was my reference point. Immediate hidden test 2 bars later after buying on the previous bar. I was in on the break of the test's high (4764) stop 1 tick below the test (4759).
Added to position (4764) on the dip back into my zone on much lower volume. Stop moved up 1 tick.
Position exited at the top of my channel 4772 after the break above it died in volume.
If I were still trading today, I'd be buying any strength back into that zone. My bullish view would change pretty quick if we see weakness under it. It is a down day, not going to get too cocky.