Simplify simplify simplify.
Remember you need to meet set criteria for a visa. You need to show you meet that criteria, don't think too much into giving a presentation of everything additional unless you actually need to. Give them what they ask for, in the format and sizes they ask for, if they need further info they will ask for more.
Think about the amount of info that's actually in the slides, it's probably image rich not evidence rich. Remember they don't need your photo catalogue.
A written timeline could be achieved on an single MS word page and avoids having to flick back and forth between 30+ slides to get the information they need.