On my Raven I like to spread the weight around, if anything it then handles better than unloaded and the only time I notice the weight is on long hills. I use;
Ortlieb Classic front rollers on the rear rack, packed with all the camping gear.
Carradice Pendle saddle bag with stuff I might need during the day, waterproofs, extra layer, tools and a bit of space for any on route shopping.
Small 18ltr panniers on the front rack, with clothes and wash kit.
Small Vaude bar bag for valuables and maps.
The only thing that isn’t bagged up is the tent poles and only then because they’re too long to fit in a pannier. That’s enough for three season camping, never too far from civilisation and I’ve never toured for more than two weeks. I’ll carry minimum cooking kit and no more than the ingredients for a couple of meals.
On my lighter non Thorn tourer, adding front panniers makes the steering feel sluggish and the bike less responsive (hard to explain, but easy to feel) I tend to use this for shorter camping trips and try and get everything into two panniers.
Front racks – I’ve only had the one, a Tubus Ergo, I like the hoop over the wheel and the frame to keep bags well away from the wheel.
Ortlieb panniers – the Plus is a bit lighter than the Classic and doesn’t look so industrial. Functionally I don’t thing there’s much difference unless you have a problem with heel clearance, then the Plus are better as they can be tilted.