I found working with bowed and twisted tongue and groove pine frustrating. Watch this video showing how I built a tool to bend bowed boards into place so I could nail them.
For some boards that are bowed convex to the installed board you can tack one and and work your way down the board muscling it into place. But, when a board was touching the installed board on both ends but not touching in the middle it was too strong to muscle into place. I needed a tool to do the job, but home depot could even fathom what I was working on, and the local hardware store knew about it but didn’t know where to get one. I tried clamping the joist with pliers and trying to pry against the pliers but it was too much work and with both hands tied up, I could operate the nail gun.
I had some scrap aluminum lying around and some angle iron used for garage door installation and got to work. I need it long ~ 40 inches or so to get some good leverage, and I needed the action to be something less than 4 inches (meaning my boards were always bowed out less than 4″ away from where they needed to be installed) I used the holes in the track to place my bolts (trial and error until I got it right) to create the lever action I needed. I cut a notch in the aluminum to use the levers downward force to clamp onto the joist and provide the fulcrum.
The rest as they say, is in the video, check it out!