everyone goes through this on their bike if they use it in all weathers... i think most people will tell you that they're still searching for the 'holy grail' of wet weather gear, that is: waterproof, breathable, lightweight, only one layer, affordable, etc etc i know you said you don't want another layer to put on, but a waterproof over jacket works very well, especially if it is the type that doesn't have a zip up front (you have to put it on over your head). Bit of a faff, but i stay completely dry on my top half when wearing this. Only downside is it's not breathable, so can't wear it during the summer, as i end up just as wet from sweating as i would have not wearing it in the rain in summer! your only other option is to shell out on some expensive gore-tex gear in my opinion... guy i park up to at work, has a rukka jacket he's had for about 6 years now and he wears it every day commuting all year round, and doesn't get wet. Also, if you do buy a gore-tex jacket and you do get wet, there is a life time guarantee with it, so you can just send it back. if i had all the money in the world to spend on motorbikes and motorbike gear, i'd probably get the top of the range Rukka two piece textile suit, but you're looking at spending nearly £2,000. But then again, if i had all the money in the world, i wouldn't be living in this country where it rains all the time!!!