How to export this PDF figure with a small size

I want to export a PDF figure with the following codes, but the size of the PDF is too big, about 1.5M. I hope the size can be around 100k. I have tried for a long time but can not find a good solution. Any help or suggestion will be highly appreciated!

\[Rho]2plus = {{0.2011205485336045077` + 
 1.`*^-6 I, -0.017422322154311026` - 
 0.508770348467936524` I, -0.01627481119236278` - 
 0.009599125271231317` I, 
0.00012377921551508936` - 
 0.0001037303194895626` I}, {-0.317422322154311026` + 
 0.008770348467936524` I, 0.5253584399150775` + 1.`*^-6 I, 
0.1810835129135062` - 0.050379441418388037` I, 
0.012122030783398718` - 
 0.00011053335415397864` I}, {-0.01627481119236278` + 

 0.009599125271231317` I, 
0.4810835129135062` + 0.050379441418388037` I, 
0.07251617971431137` + 1.`*^-6 I, 
0.011027619410833644` + 
 0.00549701145732366` I}, {0.20012377921551508936` + 
 0.0001037303194895626` I, 
0.012122030783398718` + 0.00011053335415397864` I, 
0.011027619410833644` - 0.00549701145732366` I, 
0.001004831837006529` + 1.`*^-6 I}};


\[Rho]2minus = {{0.005277185010322719` + 1.`*^-6 I, 
0.0010040157957586214` + 
 0.04371079428674348` I, -0.09005650743684472643` - 
 0.046221573555130006` I, -0.003643884304307673` - 
 0.001085378855037156` I}, {0.2010040157957586214` - 
 0.24371079428674348` I, 
0.0131515781501287` + 1.`*^-6 I, -0.1857896769310657` + 
 0.01114973388880884` I, 
0.008915832323651186` + 
 0.03176372686431984` I}, {0.5005650743684472643` + 

 0.046221573555130006` I, -0.0857896769310657` - 
 0.01114973388880884` I, 
0.07651833701845997` + 1.`*^-6 I, -0.0025963451307736015` - 
 0.034899274546212444` I}, {-0.003643884304307673` + 
 0.001085378855037156` I, 
0.208915832323651186` - 
 0.23176372686431984` I, -0.0025963451307736015` + 
 0.034899274546212444` I, 0.005052899821088675` + 1.`*^-6 I}};




figplus=GraphicsRow[
DiscretePlot3D[#@\[Rho]2plus[[i, j]], {i, 1, 4}, {j, 1, 4}, 
  BoxRatios -> {1., 1., .8}, ExtentSize -> 0.5, 
  PlotRange -> {{.5, 4.5}, {.5, 4.5}, {-.5, .526}}, 
  ColorFunction -> (Blend[{Hue[2/3], Hue[0]}, #] &), 
  ExtentElementFunction -> "ProfileCube", 
  Ticks -> {{{1, "A"}, {2, "B"}, {3, "C"}, {4, "D"}}, {{1, 
      "E"}, {2, "F"}, {3, "G"}, {4, "H"}}, Automatic}, 
  AxesEdge -> {{-1, -1}, {1, -1}, {1, 1}}, 

  FillingStyle -> Opacity[1], 
  LabelStyle -> 
   Directive[FontSize -> 12, FontFamily -> "Helvetica"], 
  Boxed -> True] & /@ {Re, Im} , ImageSize -> 500 ];



figminus =GraphicsRow[DiscretePlot3D[#@\[Rho]2minus[[i, j]], {i, 1, 4}, {j, 1, 4}, 
  BoxRatios -> {1., 1., .8}, ExtentSize -> 0.5, 
  PlotRange -> {{.5, 4.5}, {.5, 4.5}, {-.5, .523}}, 

  ColorFunction -> (Blend[{Hue[2/3], Hue[0]}, #] &), 
  ExtentElementFunction -> "ProfileCube", 
  Ticks -> {{{1, "A"}, {2, "B"}, {3, "C"}, {4, "D"}}, {{1, 
      "E"}, {2, "F"}, {3, "G"}, {4, "H"}}, Automatic}, 
  AxesEdge -> {{-1, -1}, {1, -1}, {1, 1}}, 
  FillingStyle -> Opacity[1], 
  LabelStyle -> 
   Directive[FontSize -> 12, FontFamily -> "Helvetica"], 
  Boxed -> True] & /@ {Re, Im} , ImageSize -> 500 ];
gg = Grid[{{figminus}, {figplus}}, Spacings -> {0, 0}]

Export["Fig8.pdf", gg, ImageResolution -> 600]

enter image description here

plotting - Plot 4D data with color as 4th dimension

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