diff --git a/bin/regression-wally b/bin/regression-wally
index 9a2d29201..f53940d89 100755
--- a/bin/regression-wally
+++ b/bin/regression-wally
@@ -519,7 +519,7 @@ def main():
             pass
     if args.ccov:
         TIMEOUT_DUR = 20*60 # seconds
-        os.system('rm -f questa/cov/*.ucdb')
+        os.system('rm -f questa/ucdb/* questa/cov/*')
     elif args.fcov:
         TIMEOUT_DUR = 8*60
         os.system('rm -f questa/fcov_ucdb/* questa/fcov_logs/* questa/fcov/*')
@@ -536,7 +536,7 @@ def main():
     # max out at a limited number of concurrent processes to not overwhelm the system
     # right now fcov, ccov, nightly all use Imperas
     if (args.ccov or args.fcov or args.nightly):
-        ImperasDVLicenseCount = 8 # limit number of concurrent processes to avoid overloading ImperasDV licenses
+        ImperasDVLicenseCount = 16 # limit number of concurrent processes to avoid overloading ImperasDV licenses
     else:
         ImperasDVLicenseCount = 10000 # effectively no license limit for non-lockstep tests
     with Pool(processes=min(len(configs),multiprocessing.cpu_count(), ImperasDVLicenseCount)) as pool: