trial courts should consider, but not be limited to the following factors: 1) how clearly the prior act has been proved; 2) how probative the evidence is of the material fact it is admitted to prove; 3) how seriously disputed the material fact is; and 4) whether the government can avail itself of any less prejudicial evidence. When analyzing the dangers that admission of propensity evidence poses, the trial court should consider: 1) how likely is it such evidence will contribute to an improperly-based jury verdict; and 2) the extent to which such evidence will distract the jury from the central issues of the trial. [Citation omitted.] Any other matter which the trial court finds relevant may be considered. In particular, as proof of the prior act may largely rest upon testimony of the victim of that prior act, the credibility of that individual would be a factor for the court’s consideration. Further, the propensity evidence must be established by clear and convincing evidence. If the defense raises an objection to the admission of the propensity evidence, the trial court should hold a hearing, preferably pre-trial, and make a record of its findings as to the factors set forth above.