diff --git a/cmd/flag/common.go b/cmd/flag/common.go
index d634c80..9256e5c 100644
--- a/cmd/flag/common.go
+++ b/cmd/flag/common.go
@@ -1,7 +1,6 @@
 package flag
 
 import (
-	"fmt"
 	"os"
 
 	irodsclient_config "github.com/cyverse/go-irodsclient/config"
@@ -34,7 +33,7 @@ var (
 )
 
 func SetCommonFlags(command *cobra.Command, noResource bool) {
-	command.Flags().StringVarP(&commonFlagValues.ConfigFilePath, "config", "c", "", fmt.Sprintf("Set config file or directory (default %q)", commons.GetDefaultIRODSConfigPath()))
+	command.Flags().StringVarP(&commonFlagValues.ConfigFilePath, "config", "c", commons.GetDefaultIRODSConfigPath(), "Set config file or directory")
 	command.Flags().BoolVarP(&commonFlagValues.ShowVersion, "version", "v", false, "Print version")
 	command.Flags().BoolVarP(&commonFlagValues.ShowHelp, "help", "h", false, "Print help")
 	command.Flags().BoolVarP(&commonFlagValues.DebugMode, "debug", "d", false, "Enable debug mode")
diff --git a/commons/constant.go b/commons/constant.go
index c147e9f..703cdea 100644
--- a/commons/constant.go
+++ b/commons/constant.go
@@ -7,11 +7,13 @@ import (
 )
 
 const (
+	goCommandsRepoPackagePath string = "cyverse/gocommands"
+
 	ClientProgramName          string                     = "gocommands"
 	FilesystemTimeout          irodsclient_types.Duration = irodsclient_types.Duration(10 * time.Minute)
 	TransferThreadNumDefault   int                        = 5
 	UploadThreadNumMax         int                        = 20
-	TCPBufferSizeDefault       int                        = 4 * 1024 * 1024
-	TCPBufferSizeStringDefault string                     = "4MB"
+	TCPBufferSizeDefault       int                        = 1 * 1024 * 1024
+	TCPBufferSizeStringDefault string                     = "1MB"
 	RedirectToResourceMinSize  int64                      = 1024 * 1024 * 1024 // 1GB
 )
diff --git a/commons/upgrade.go b/commons/upgrade.go
index 16fda43..1046322 100644
--- a/commons/upgrade.go
+++ b/commons/upgrade.go
@@ -18,13 +18,13 @@ func CheckNewRelease() (*selfupdate.Release, error) {
 
 	logger.Infof("checking latest version for %s/%s", runtime.GOOS, runtime.GOARCH)
 
-	latest, found, err := selfupdate.DetectLatest(context.Background(), selfupdate.ParseSlug("cyverse/gocommands"))
+	latest, found, err := selfupdate.DetectLatest(context.Background(), selfupdate.ParseSlug(goCommandsRepoPackagePath))
 	if err != nil {
 		return nil, xerrors.Errorf("error occurred while detecting version: %w", err)
 	}
 
 	if !found {
-		return nil, xerrors.Errorf("latest version for %s/%s could not be found from github repository 'cyverse/gocommands'", runtime.GOOS, runtime.GOARCH)
+		return nil, xerrors.Errorf("latest version for %s/%s is not found from github repository %q", runtime.GOOS, runtime.GOARCH, goCommandsRepoPackagePath)
 	}
 
 	return latest, nil
@@ -38,13 +38,13 @@ func SelfUpgrade() error {
 
 	logger.Infof("checking latest version for %s/%s", runtime.GOOS, runtime.GOARCH)
 
-	latest, found, err := selfupdate.DetectLatest(context.Background(), selfupdate.ParseSlug("cyverse/gocommands"))
+	latest, found, err := selfupdate.DetectLatest(context.Background(), selfupdate.ParseSlug(goCommandsRepoPackagePath))
 	if err != nil {
 		return xerrors.Errorf("error occurred while detecting version: %w", err)
 	}
 
 	if !found {
-		return xerrors.Errorf("latest version for %s/%s could not be found from github repository 'cyverse/gocommands'", runtime.GOOS, runtime.GOARCH)
+		return xerrors.Errorf("latest version for %s/%s could not be found from github repository %q", runtime.GOOS, runtime.GOARCH, goCommandsRepoPackagePath)
 	}
 
 	myVersion := GetClientVersion()