Yes, I can. Moreover, I studied the hearsay rule in law school and have continued to study it and apply it in years of law practice. You on the other hand are not reading it closely and obviously have no experience with the hearsay rule. Instead, you are trying to add something to it that is not there to get to what you think hearsay is.
The definition of "declarant" is given in (B): it is simply "a person who makes a statement." You are the declarant with respect to your affidavits because you are the one making a statement.
You did not read it carefully. It does not say hearsay is a statement made by someone not at trial. It says that hearsay is: "is a statement, other than one made by the declarant whiletestifying at the trial or hearing, offered in evidence to prove the truth of the matter asserted." (Bolding added.) Hearsay focuses on the statement being made outside of court, not whether the person shows up for trial. The person might well be at the trial, but his statements made outside of court are hearsay and cannot be admitted unless some exception applies. And nothing in the rule limits hearsay to just those things the person repeats from someone else, as you want it to be. It includes ANy statement made outside of court, including statements of what the person making the statement (the declarant) personally witnessed. Read the rule again for what it says rather than what you want it to say. It says that any out of court statement of the declarant (the person making the statement) offered to prove the matter asserted is hearsay. Not just things the declarant heard from someone else — that limitation is nowhere in the rule. It simply says "a statement," which covers any kind of statement.
There are some instances in which affidavits and other statements made out of court are admissible at trial, but you have to find the exception in the rules that cover it. Otherwise, if the opposing side makes a hearsay objection and you can't point to an exception that allows it, the court will sustain the hearsay objection. Affidavits are much more commonly used in summary judgment motions — See Ohio Civ. rule 56. You don't have hearings for summary judgment, so the affidavits provide what is needed to substitute for in court testimony. You are not in a summary judgment situation; you are facing a hearing on your petition. At the hearing, the judge will want to hear you testify about what you saw and heard that supports your petition; the judge cannot use your affidavits instead as they are hearsay. You lose nothing by this: you get your chance to tell your story to the judge in person. So focus on what you are going to say and what other evidence (other witnesses, etc) you have to support your case. That's what is important now.