Sea star fluid, the bleeder hoses came with the boat. I'll try bleeding the system again this year. Went through this last year , hoping for a permanent fix. Perhaps l didn't remove the air bubbles completely.
What kind of fluid was currently in there? When you bled it, was it a dark or red color?
Was it nice and easy after you bled it last year? Can you describe how you bled it? From your first post, it didn't appear that you know the proper procedure.
Having air in the system doesn't necessarily make it harder to steer - but it will make it feel bumpy/lumpy as you turn the wheel. Old/wrong fluid can cause it to be stiff.
Don't just bleed the bubbles out and stop. As I noted above, get rid of all the old stuff. You can suck it out - and then keep running new stuff through till it's clean.
As Bill mentioned, disconnect the steering from the engine and try moving it by hand - it should be easy.