Emulated the particle scale hack performed by QuakeSpasm by slightly increasing the start size of each particle (1.08 x 1.27 = 1.38) and by setting a minimum particle screen size.

Assets/Styles/GLQuake/Particles/LavaSplash.prefab

@@ -284,7 +284,7 @@ ParticleSystem:
     startSize:
       serializedVersion: 2
       minMaxState: 0
-      scalar: 1.27
+      scalar: 1.38
       minScalar: 1
       maxCurve:
         serializedVersion: 2
@@ -4839,7 +4839,7 @@ ParticleSystemRenderer:
   m_SortingOrder: 0
   m_RenderMode: 0
   m_SortMode: 0
-  m_MinParticleSize: 0
+  m_MinParticleSize: 0.003
   m_MaxParticleSize: 0.5
   m_CameraVelocityScale: 0
   m_VelocityScale: 0

Assets/Styles/GLQuake/Particles/ParticleEffect.prefab

@@ -284,7 +284,7 @@ ParticleSystem:
     startSize:
       serializedVersion: 2
       minMaxState: 0
-      scalar: 1.27
+      scalar: 1.38
       minScalar: 1
       maxCurve:
         serializedVersion: 2
@@ -4839,7 +4839,7 @@ ParticleSystemRenderer:
   m_SortingOrder: 0
   m_RenderMode: 0
   m_SortMode: 0
-  m_MinParticleSize: 0
+  m_MinParticleSize: 0.003
   m_MaxParticleSize: 0.5
   m_CameraVelocityScale: 0
   m_VelocityScale: 0

Assets/Styles/GLQuake/Particles/ParticleExplosion.prefab

@@ -285,7 +285,7 @@ ParticleSystem:
     startSize:
       serializedVersion: 2
       minMaxState: 0
-      scalar: 1.27
+      scalar: 1.38
       minScalar: 1
       maxCurve:
         serializedVersion: 2
@@ -4840,7 +4840,7 @@ ParticleSystemRenderer:
   m_SortingOrder: 0
   m_RenderMode: 0
   m_SortMode: 0
-  m_MinParticleSize: 0
+  m_MinParticleSize: 0.003
   m_MaxParticleSize: 0.5
   m_CameraVelocityScale: 0
   m_VelocityScale: 0
@@ -5147,7 +5147,7 @@ ParticleSystem:
     startSize:
       serializedVersion: 2
       minMaxState: 0
-      scalar: 1.27
+      scalar: 1.38
       minScalar: 1
       maxCurve:
         serializedVersion: 2
@@ -9702,7 +9702,7 @@ ParticleSystemRenderer:
   m_SortingOrder: 0
   m_RenderMode: 0
   m_SortMode: 0
-  m_MinParticleSize: 0
+  m_MinParticleSize: 0.003
   m_MaxParticleSize: 0.5
   m_CameraVelocityScale: 0
   m_VelocityScale: 0

Assets/Styles/GLQuake/Particles/TeleportSplash.prefab

@@ -284,7 +284,7 @@ ParticleSystem:
     startSize:
       serializedVersion: 2
       minMaxState: 0
-      scalar: 1.27
+      scalar: 1.38
       minScalar: 1
       maxCurve:
         serializedVersion: 2
@@ -4839,7 +4839,7 @@ ParticleSystemRenderer:
   m_SortingOrder: 0
   m_RenderMode: 0
   m_SortMode: 0
-  m_MinParticleSize: 0
+  m_MinParticleSize: 0.003
   m_MaxParticleSize: 0.5
   m_CameraVelocityScale: 0
   m_VelocityScale: 0