Your amp is good enough to drive it but I don't think it has enough power to drive them properly. The only way to tell is try it. Also try a more powerful amp just to see how it works out.
I nervously bought the VSA99's without audition due to location. But make no mistake, I researched speakers for aprox a year and a half- reading and asking many questions from experienced audiophiles.
Buying these 99's is the single best decision in audio land I have ever made. I would encourage you to listen to those who share there ideas with you. Also- I am not sure I have read anywhere/anyone who after hearing the VR4Sr and the 99's that they thought the VR4Sr was better. Perhapse you should run a post asking for comparisons of the two. I would also recommend you call or e-mail Von Schweikert for a convo on sound differences. And for what your paying for the VR4 you could get the 99. 99 also come in ebony.
One last thing- think about cost of selling and then buying another amp?
You might also consider the new ICEPowered BelCanto Design Ref 1000 Mono amps. for the Sr's. The VR4Sr's are a terrific speaker system on par with the 99's sonic qualities,,I'm living with both. The 99's are being driven by a SET40 with KR845 tubes. Simply stunning and seductive.
Terrific extension, detail and wallop when the 4Sr's are driven with hi powered SS gear or something with a palpable touch like a VAC Avatar Integrated tube amp. The VAC works nicely with the 99's as does does the Cayin A-88T Integrated.
As disclosure, I am a dealer for the above, and I've had loads of equipment pass thru before settling in with the amps I've mentioned. All offer terrific value.
BTW, also consider the Verbatum cables from Paul Garner.