Can I cheat and not get caught?

I bought a nice Accuphase P-450 power amp recently and was surprised to find the speaker connectors accept only bare wire or VERY large spades. Since my speakers are Vandersteen 3As, I had HCM Audio make a set of double bi-wired cables to the tune of over $300 (I know, that's cheap in the big scheme of things) and was shocked when the 5/16
spades would not fit over the posts. I was finally able to force the spade(s) barely onto the post and tighten the connector enough to secure it, but I'm wondering if it would be better to insert one prong of each spade into the hole for bare speaker wire, then tighten the connector. Or should I try to widen the gap in each spade slightly/carefully to get a better conventional connection? 
What’s wrong with bare wire?  Had some LAT International banana terminated wire.  Banana broke, so I clipped and stripped all ends.  Wire sounded way better bare.
Discnik, I'll swing by this weekend with a dremel tool and I'll also bring a rat-tail file. Some good suggestions here so we should be able to figure it out in short order.
Thanks sonvolt… must have gotten time-off for good behavior and be back in the game.
With a good quality power amp you should not have this problem.Good luck though!!