I will assume that you're doing doubles and triples as a freeskater since the 2010's are a freeskate boot. As someone else pointed out, you should wear the right boots.
Finding the spot on the heel for turns is typically more of a skate/blade fitting issue than any particular make or model. If your heel is pulling up, the heel cup is too big for your foot. You can order a split-width boot from most manufacturers. Your boots' padding may have compressed, causing the heels to be a little loose. Some skate techs do rebuilds - ask if you want to save some money.
Having too-long boots and blades can also cause this problem, depending on where your foot sits inside that skate. Most fitters mount the blade with the front against the front edge of the boot sole, so the forward rocker is positioned correctly. However, if the blade is too long, the heel stanchion will be too far back to be useful. ie. instead of turning a back bracket under the middle/heel of your foot, you have to really pick up and turn on the back of your heel.
Don't confuse the blade length/stanchion position with the length of the blade's tail. Some blades have longer tails behind the back stanchion, it varies by model.
I can understand your wanting new boots, just make sure to get measured properly.
Our fitter told me that SP-Teri fit more like Jacksons than Riedells, when you compare the fit for the same-size boots. I think that's only in the wider forefoot because the Jackson heel cup was uncomfortable for me, whereas the SP-Teri heel cup fit more like my Klingbeil boots.
I wonder if the backstrap height would affect finding the stanchion? It makes pointing the free foot more difficult in Ice Dance, which is why dancers wear boots with the backs cut lower. I don't think that boots themselves would make backward turns any harder or easier...