diff --git a/gui/KCC.ui b/gui/KCC.ui
index 63dd857..3359be8 100644
--- a/gui/KCC.ui
+++ b/gui/KCC.ui
@@ -473,7 +473,7 @@
        <item>
         <widget class="QSpinBox" name="chunkSizeBox">
          <property name="minimum">
-          <number>100</number>
+          <number>50</number>
          </property>
          <property name="maximum">
           <number>600</number>
diff --git a/kindlecomicconverter/KCC_ui.py b/kindlecomicconverter/KCC_ui.py
index 3574d15..c781a97 100644
--- a/kindlecomicconverter/KCC_ui.py
+++ b/kindlecomicconverter/KCC_ui.py
@@ -266,7 +266,7 @@ class Ui_mainWindow(object):
 
         self.chunkSizeBox = QSpinBox(self.chunkSizeWidget)
         self.chunkSizeBox.setObjectName(u"chunkSizeBox")
-        self.chunkSizeBox.setMinimum(100)
+        self.chunkSizeBox.setMinimum(50)
         self.chunkSizeBox.setMaximum(600)
         self.chunkSizeBox.setValue(400)
 
diff --git a/kindlecomicconverter/comic2ebook.py b/kindlecomicconverter/comic2ebook.py
index 7c119fc..fa5a7f0 100755
--- a/kindlecomicconverter/comic2ebook.py
+++ b/kindlecomicconverter/comic2ebook.py
@@ -1423,6 +1423,8 @@ def checkOptions(options):
         options.format = 'MOBI'
         if options.batchsplit != 2:
             options.batchsplit = 1
+    if not options.targetsize and options.profile.startswith('Rmk'):
+        options.targetsize = 95
     if options.format == 'MOBI+EPUB':
         options.keep_epub = True
         options.format = 'MOBI'
@@ -1775,4 +1777,3 @@ def makeMOBI(work, qtgui=None):
     makeMOBIWorkerPool.close()
     makeMOBIWorkerPool.join()
     return makeMOBIWorkerOutput
-