Vactrol to ground, not series? Help please

[blackieNYC]

On the output of an op amp I have a cap, then a series variable resistor, then a vactrol VTL53C to ground. If the series resistor is very small, i get full volume out but no tremolo.  The output doesn't see the vactrol deviations as anything to fluctuate about, probably because the vactrol is going from 10 meg or whatever down to a minimum of something like 2k I think.  As I turn up the variable resistor, it acts as a voltage divider decreasing the signal. The minimum value of the vactrol then appears smaller, and I start to get a little tremolo. The bigger the series resistor, the smaller the output voltage, but - the tremolo swings deeper. So, I give the preceding op amp some feedback gain. This works, and the tremolo stays deepened, and the output signal is strong.  But the tremolo depth maxes out stubbornly at 7 dB. Any more gain from the op amp and I clip.
Is there a circuit which uses an LDR to ground for tremolo? Maybe something other than the VTL53C? It would be a very simple way to get stereo panning tremolo from a vactrol based mono tremolo. Ive seen other stereo designs and they would constitute a whole new pedal than the multi-function one i hav going here.  My other vactrol is in series, fed by a different op amp and working nicely.

[blackieNYC]

Maybe I can put this vactrol into the feedback loop of the op amp and use the non inverting input?  Trim the gain down before the op amp? Somehow?

[PRR]

> Is there a circuit which uses an LDR to ground for tremolo?

All BlackFace Fender amps.

[blackieNYC]

Well there ya go!  Didn't find it in a pedal search
Maybe I can put this vactrol into the feedback loop of the op amp and use the non inverting input?  Trim the gain down before the op amp?
Edit:  it works.  A little build report now, with a couple questions.
 The vactrol resistance appears to be too much for a feedback gain resistor, so I have a 210k resistor in parallel with it. This gives about a thirty dB swing in modulation depth. 100mV(-17dBu) input, knocked down to 38mV because of the following gain to come. The op amp boosts it up to just over 1v(+6dBu), and I trim the output back down to 100mV.  
I can only breadboard one vactrol at a time right now, but I'm using the tremulous lune LFO depth circuit, and when I had the vactrol in series, the audio was with the LED coming on, and this FB loop vactrol audio is opposite.  For the input to the stereo panning channel I can come off the wiper of the output volume pot, trim a level internally to balance.  Nope, that's dumb- the output pot has the opposite tremolo on it.  I am splitting the output of the input buffer.
Now, I have a gain of 10 on the op amp, right?  100mv in and 1v out.   With this gain setting I clip it with a 160mV (-14dBu) input, which isn't much.  But I can back off the FB gain a little, and lose a little tremolo depth cuz there seems to be plenty now.  I think it's more that 30 dB. I'll roll back the FB gain to a reasonable trem depth and see what it takes to clip.
Thanks for hearing me out.  This started as a question, and it still needs some answers. Like, is there a better way to do this? But it looks like I gotten stereo panning out of a tremulous lune without inverting the phase of the LFO and so forth. I don't know- is this easier?  I've added half a TLO72, two caps and two Rs. And a vactrol of course, which is simply tacked on the the other vactrol in parallel, with no extra resistors.  Dulls the rate LED a bit, but doesn't change the LFO.  strike that - Ive tacked the vactrol in parallel to the rate LED, which is an identical circuit to the original mono tremolo vactrol. Same diff.