Redosing for me once the first hit had peaked was usually a waste of time. It may have added a little intensity, but not nearly as much as you'd expect having just doubled up on your starting dose. If I was unfamiliar with the type of acid we'd got hold of I'd do one tab, wait an hour for it to come up so as to gauge how potent I thought it was gonna be, and either redose there or leave it at that. For tabs I was used to handling I'd just double or triple drop right from the off and have done with it.
Rio, 180ug is bloody good. The renowned 1960s Owsley stuff was around 250-270ug I think, and deemed to be some of the best ever made. Quick google says acid tested in recent years has been as low as 50-60ug, 100ug being typical. It does depend how well it's made I think as well as dose. You'd think LSD is LSD is LSD but back in the day different acids could be enormously different not just in strength, but in the subjective character of the trip. Strawberries were sunshiney, giggly, sociable fluff, Purple Oms we're seriously intense with a deep, dark introspective character all of their own, and my favourites. Black microdots were seriously strong and different in character again. Never quite understood how they could be so different even allowing for variations in strength cos I used to dose high regardless.
We always used to smoke A LOT of draw on it. It was all resin back in the day, soft pakistani black, hard moroccan, red and black Leb. It can help bring the intensity of the visuals up, and used to send me deep down into closed eyes introspection, but at the expense of added confusion, paranoia and anxiety at times. We didn't know any better I guess, but these days I'd keep off the weed. Maybe at the very end of the trip to help with the comedown, but I'd want decent acid to be untainted by other perhaps contradictory drug effects so as to keep it as pure as possible. Think you'd get more from it in it's pure state if you're looking to explore your inner self and see what you can do with the acid as you steer it around the corners of your mind.
[EDIT]Realise I've probably come a little too late to this thread cos Rio will either be in orbit as we speak, or making preparations for re-entry. Ah, wtf. Jealous big-time. First time ever on decent strength acid, everything you experience being a constant source of wonder and delight. What's not to love?[/EDIT]