Dynavector XV-1S ---is it overkill for my system?

Personally, I've succumb to Lloyd Walker's sonic philosophy that uses a solid state phono stage. This is mostly due to modern times with cartridges having smaller output voltages. SS is just a more stable amplifying device for very, very small signals. I still prefer tubes in my line stage and amplifier, but I have been very happy since moving to SS phono stages.
My favorite has been the Klyne 7PX5.0, but these may be out of your price range. If I were you, I'd keep my eye out for an older Klyne phono stage. They don't come up often, but it will be worth the wait, IMHO.

I have heard the heed phono in my system. It is a good budget phono stage.
You will not be getting anywhere near the performance potential of the XV-1s without a better phono stage.

Cheers

Okay, how does this sound---Dynavector XX-2 MKII with a JLTi phono pre---opinions?

While procewise a step down from your current phono stage, maybe you should audition. Dyna P75. You get synergy with Dyna carts, and the ability to run in PE mode, which works especially well with thelow impedance Dyna carts like the XX-2 or 20X2L.

For your setup, either keep your cart and upgrade your phono stage or funds permitting, do both.

As for phono stage, I'd recommend either a Sutherland 20/20 or Parasound JC-3 or better yet a Linn Uphorik.

For a cart, I'd recommend either the Dynavector XX-2 MKII or the Lyra Delos. Anything more would be overkill for your setup.