Four questions, Mark, again designed to improve your chances. Please give careful thought to the issues. If you can't come up with detailed legal language that supports everything you want to do and how you want to do it, you might be wasting your time and that would be unfortunate. I wish I had answers to the following questions for you, but I don't have a copy of the bylaws.
1) Can 10% of the owners really force the Board to disseminate your recommendations (e.g., for changes in the bylaws) to all of the owners? I haven't seen that in any bylaws language you have quoted. All I saw you post was that the Board has the power to propose changes to the bylaws (post #320). Further, you could speak on the issues at the Special Meeting, but that wouldn't reach the many who would have already voted by mail before the meeting starts.
2) Can you really change the bylaws with a vote of 50% +1 of those voting, as you seem to imply? I have copies of bylaws for four Marriott resorts, not including yours. All of those require more than 50% (or sometimes two-thirds) of all owners or ownership interests (not just those voting) to change the bylaws. Typical language (from Grand Chateau): "...these Bylaws may be amended by the vote or written assent of a majority of Owners...." And from Custom House, "...the [bylaw] amendment shall be adopted if it is approved by not less than two-thirds (2/3) of the total votes of all members...." If you have ever served on a timeshare HOA or other large HOA, you know that it's just about impossible to get as much as a 40% response to a vote request, let alone get 50% of the total ownership voting with you, especially when you consider that the Board would likely suggest to owners that your recommended changes would be disruptive and costly to the HOA.
3) What's your plan for lobbying the owners to vote for what you want? I don't see anything that gives you the right to include in the special meeting notice your own arguments for removing one or more directors. It also appears that you need more than 50% of all owners, not just those voting, to remove a director. See the specific language that requires a majority of "all of the voting interests", not just a majority of those voting. (I'll grant that there is some other contradictory language that could require a court to rule on.) That's just about impossible to get, because so many people will throw away the ballot rather than bother to read it and respond. And a fair number will be impressed with the HOA's plea for the status quo and might not have in front of them your reasons for wanting removal. Even if you are successful, because all owners get to vote on new directors, all candidates would be included in the initial notice to owners, likely with the HOA's recommendations.
4) As to one of your primary issues, nothing I have seen in what you have posted gives 10% of the owners any authority to force the Board to roll back the fees or refuse to complete the 43% roof agreement with Marriott or force a vote of the owners on the issues. How can you accomplish that, especially since the Board is now saying it's all resolved?