diff --git a/Font5x7.c b/Font5x7.c
index 2eab2eb..9ab283f 100644
--- a/Font5x7.c
+++ b/Font5x7.c
@@ -958,8 +958,8 @@ const uint8_t x5x7_bits[] =
      +--------+ */
   0b01100000|CHAR5x7_WIDTH_5px,
   0b10010000,
-  0b10110000,
-  0b11010000,
+  0b10010000,
+  0b10010000,
   0b10010000,
   0b10010000,
   0b01100000,
diff --git a/Font7x13b.c b/Font7x13b.c
index 6b72062..dc882ac 100644
--- a/Font7x13b.c
+++ b/Font7x13b.c
@@ -1345,8 +1345,8 @@ const uint8_t x7x11b_bits[] =
 		0b01111000,
 		0b11001100,
 		0b11001100,
-		0b11011100,
-		0b11101100,
+		0b11001100,
+		0b11001100,
 		0b11001100,
 		0b11001100,
 		0b11001100,
diff --git a/main.c b/main.c
index 6a72f70..529ef4b 100644
--- a/main.c
+++ b/main.c
@@ -202,6 +202,10 @@ static THD_FUNCTION(Thread1, arg)
 
 }
 
+#pragma GCC push_options
+#pragma GCC optimize ("Os")
+
+
 int
 is_paused(void)
 {
@@ -2705,6 +2709,7 @@ static DACConfig dac1cfg1 = {
 };
 #endif
 
+#pragma GCC pop_options
 
 static const GPTConfig gpt4cfg = {
   1000000, // 1 MHz timer clock.
diff --git a/nanovna.h b/nanovna.h
index e2de97f..03e950e 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -409,7 +409,7 @@ extern const uint8_t numfont16x22[];
 #define bFONT_GET_DATA(ch)   (  &x7x11b_bits[(ch-bFONT_START_CHAR)*bFONT_GET_HEIGHT])
 #define bFONT_GET_WIDTH(ch)  (8-(x7x11b_bits[(ch-bFONT_START_CHAR)*bFONT_GET_HEIGHT]&7))
 
-#if 1                               // Set to 0 to save 3kByte
+#if 1                               // Set to 0 to save 3kByte and loose nice font
 #define wFONT_START_CHAR   0x17
 #define wFONT_MAX_WIDTH      12
 #define wFONT_GET_HEIGHT     14
diff --git a/plot.c b/plot.c
index fe07e07..299007e 100644
--- a/plot.c
+++ b/plot.c
@@ -25,7 +25,7 @@
 
 
 #pragma GCC push_options
-// #pragma GCC optimize ("O2")      // Makes the code just a bit faster, disable during debugging.
+#pragma GCC optimize ("Og")      // Makes the code just a bit faster, disable during debugging.
 
 
 #ifdef __SCROLL__
diff --git a/sa_core.c b/sa_core.c
index dc7cb68..7a0d1e5 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -21,7 +21,7 @@
 #include "stdlib.h"
 
 #pragma GCC push_options
-#pragma GCC optimize ("Os")             // "Os" causes problem in selftest!!!!!!!!
+#pragma GCC optimize ("Os")
 
 
 //#define __DEBUG_AGC__         If set the AGC value will be shown in the stored trace and FAST_SWEEP rmmode will be disabled
@@ -903,10 +903,12 @@ void set_scale(float t) {
   round_reflevel_to_scale();
 }
 
+extern char low_level_help_text[12];
 
 void set_offset(float offset)
 {
   setting.offset = offset;
+  plot_printf(low_level_help_text, sizeof low_level_help_text, "%+d..%+d", -76 + (int)offset, -6 + (int)offset);
   force_set_markmap();
   dirty = true;             // No HW update required, only status panel refresh but need to ensure the cached value is updated in the calculation of the RSSI
 }
diff --git a/ui_sa.c b/ui_sa.c
index 264dfc9..714e948 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -1486,11 +1486,12 @@ static const menuitem_t  menu_sweep[] = {
   { MT_FORM | MT_NONE, 0, NULL, NULL } // sentinel
 };
 
+char low_level_help_text[12] = "-76..-6";
 
 static const menuitem_t  menu_lowoutputmode[] = {
   { MT_FORM | MT_ADV_CALLBACK, 0,               "LOW OUTPUT            %s", menu_outputmode_acb},
   { MT_FORM | MT_KEYPAD,   KM_CENTER,           "FREQ: %s",         "10kHz..350MHz"},
-  { MT_FORM | MT_KEYPAD,   KM_LOWOUTLEVEL,      "LEVEL: %s",        "-76..-6"},
+  { MT_FORM | MT_KEYPAD,   KM_LOWOUTLEVEL,      "LEVEL: %s",        low_level_help_text /* "-76..-6" */},
   { MT_FORM | MT_ADV_CALLBACK,  0,              "MOD: %s",   menu_smodulation_acb},
   { MT_FORM | MT_ADV_CALLBACK,  0,              "%s",      menu_sweep_acb},
 //  { MT_FORM | MT_KEYPAD,   KM_SPAN,             "SPAN: %s",         "0..350MHz"},
@@ -1508,7 +1509,7 @@ static const menuitem_t  menu_highoutputmode[] = {
   { MT_FORM | MT_ADV_CALLBACK,   0,     "MOD: %s",   menu_smodulation_acb},
   { MT_FORM | MT_KEYPAD,    KM_SPAN,    "SPAN: %s",         NULL},
   { MT_FORM | MT_KEYPAD,  KM_SWEEP_TIME,"SWEEP TIME: %s",   "0..600 seconds"},
-  { MT_FORM | MT_KEYPAD,  KM_OFFSET,            "AMP: %s",          "-100..+100"},
+  { MT_FORM | MT_KEYPAD,  KM_OFFSET,            "EXTERNAL AMP: %s",          "-100..+100"},
   { MT_FORM | MT_CANCEL,    0,          "MODE",             NULL },
   { MT_FORM | MT_NONE, 0, NULL, NULL } // sentinel
 };