I don't think price is that reflective of perceived performance. So I think you are much better off trying cheaper less well known triodes. There are very few NOS 300Bs and 2A3s left at reasonable prices.
Why not try 6B4G with some adaptors that can be had cheaply on ebay?
Also, the Sylvania 6A3 is not what I have - mine are Tung Sol. In my experience valves of the same type by different manufacturers do not sound the same. That is, however, no reason for your 6A3s to sound distorted. Surely if the EML 45s don't suffer from this aren't they really the better option?
If you feel like taking a bit more of a risk
http://www.hifishark.com/ is a good search tool for valves. It includes Jap Yahoo auctions. But the translations are well dodgy. They seem to have a lot of WE valves in Japan.
WRT Psvane 101D you could always sell them on quickly if you don't like them. I don't think you'd lose that much money.