2011 Yamaha 115 hp trouble

We have a 2011 yamaha with 91 hours on it. It sat all last year with little gas in it. Yes, we had used gas with ethanol. When we used it this year, we only could only get 4400 rpms. If we accelerated, it bogged down. We have changed the interior and exterior filters, had the fuel separators cleaned, had the bottom fuel pump filter cleaned, had the fuel injectors cleaned, and replaced the ethanol gas with non ethanol gas. All of this has made no difference. It still bogs down like it's starving for gas and only 4400 rpms. All mechanics are at a loss as to what to try next. Any ideas you could share would be greatly appreciated! Thanks in advance as our summer is quickly shrinking!

How does it idle? If it idles rough it could be one or two injectors are stuck. I suggest you to get an external 6 gal gas tank and fill it up with fresh gas and then water test it. If it still the same then check to make sure all the injectors are clicking while the engine is running. You are either have water in the gas or the injectors not firing on all 4. The majority of the running issues with all the outboards are fuel related. This is from my experience. GL