First of all, the full-size antenna performs much better than adding a coil.
Secondly, a GP lever can be configured for easy installation and adjustment of frequency.
Upgrade to a standard V-shaped pole. Also, install two 10-meter end lines and try out the 40-meter inverted V.
I'm referring to the environment in a field setting, because the requirements for a fixed installation environment are too demanding. If possible, it's best to start with 750 MHz and then gradually explore other options later. Initially, focus on getting the antenna set up correctly. Ultimately, you need to build your system based on your own specific conditions.