If I am reading this right, you just started using your new equipment right?
It's probably going to be harder to control for the first few days. You need to get used to your new gear, find the right set-up for the bindings, boot tightness etc. Learn how the board/bindings react to what inputs.
The rental board may have been more forgiving, with blunter edges, and softer bindings.
I just bought brand spanking new Salomon Caliber bindings and Salomon Synapse boots (which are both pretty hard on the flex scale). That, and I had my board sharpened for the first time in years. First 2 days I wasn't feeling confident at all, worried I'd be catching edges all the time, despite riding for more than 15 years. But after a few trials with adjusting my stance, boot tightness, and in general getting to know the new set-up, on my 3rd day I was having one of the best days boarding ever.
One thing I did have in mind when buying my new boots/bindings, was to keep to the same brand. Then you have little to worry about how well the boots fit the bindings. My board is a '99 Burton Rippey, so I initially wanted an all Burton set up, but after trying on loads of shoes, Salomons were the most comfortable, so I matched them to some badass Caliber bindings. I wanted a new set-up with good response, and response is what I got
But yeah, don't go blaming your new gear just yet. Experiment with what you have, and hopefully you will find the right set-up soon.