https://pokepast.es/cb95a5507a24484c
I don't know if you consider this a good record but I went 30-5 with H Decidueye which I feel is really good considering I have him on the team. I changed team quite a bit until I arrived at this.
The team is pretty solid, especially with my extremely extensive testing now that I made 3 different Alts to try H Decidueye. The games I lost also only because I got outplayed.
2 of my losses were to Veil which I had the tools to win in one of them but misplayed and other I got crit. Other 2 were to Dragon Dancers with tech Teras which I predicted wrong. Last one was to BS Agility Scope Lens Gallade which crit my Primarina and Pult despite me knocking him off.
I think you should definitely give it a shot. It's very unique in how it plays and Deci has really developed as an integral piece of the team. It absolutely doesn't let Tusk, Ting Lu or Samu H get up hazards and he is the primary check to these for the team and the surprising thing is that he works really well. Much better than I imagined.