diff --git a/lotus-soup/common_roles.go b/lotus-soup/common_roles.go
index 9d5c1d1b7..27017bf8a 100644
--- a/lotus-soup/common_roles.go
+++ b/lotus-soup/common_roles.go
@@ -3,7 +3,6 @@ package main
 import (
 	"context"
 	"fmt"
-	"math/rand"
 	"time"
 
 	"github.com/filecoin-project/lotus/build"
@@ -54,15 +53,15 @@ func runMiner(t *TestEnvironment) error {
 			stateMineNext := sync.State(fmt.Sprintf("mine-block-%d", i))
 			t.SyncClient.MustSignalAndWait(ctx, stateMineNext, miners)
 
-			// add some random delay to encourage a different miner winning each round
-			time.Sleep(time.Duration(100 + rand.Intn(int(100*time.Millisecond))))
-
+			ch := make(chan struct{})
 			err := miner.MineOne(ctx, func(mined bool) {
 				t.D().Counter(fmt.Sprintf("block.mine,miner=%s", myActorAddr)).Inc(1)
+				close(ch)
 			})
 			if err != nil {
 				panic(err)
 			}
+			<-ch
 		}
 
 		// signal the last block to make sure no miners are left stuck waiting for the next block signal
@@ -81,6 +80,8 @@ func runMiner(t *TestEnvironment) error {
 	t.RecordMessage("shutting down mining")
 	<-done
 
+	time.Sleep(3600 * time.Second)
+
 	t.SyncClient.MustSignalAndWait(ctx, stateDone, t.TestInstanceCount)
 	return nil
 }
diff --git a/lotus-soup/compositions/composition-k8s-10-3.toml b/lotus-soup/compositions/composition-k8s-10-3.toml
index 7110e8114..91b0276d7 100644
--- a/lotus-soup/compositions/composition-k8s-10-3.toml
+++ b/lotus-soup/compositions/composition-k8s-10-3.toml
@@ -20,7 +20,7 @@
   miners = "3"
   genesis_timestamp_offset = "100000"
   balance = "2000"
-  sectors = "10"
+  sectors = "20"
 
 [[groups]]
   id = "bootstrapper"