As matter of fact, yes, I do.
My view of salary negotiation is I myself and company come into conclusion what is the "fair" compensation for my experience and skills, regardless of what is my previous pay. So, if either party do not come into such agreement, I would politely decline the offer.
If you goes into the negotiation with the above said mindset, unless you inflated your last drawn salary, then, u got nothing to lose to demand whatever you think you deserve.
If they just offered u 20-30% increment, you can just walk away, declining the offer, nothing to lose. But, if they agree to pay what you expected, you got the job. But, now, by not providing your last drawn salary evidence, u totally blew away the opportunity. Are you telling me that you more than happy to accept current salary which is lower than your "expected min" 20-30% increase?