Is there any harm in intentionally delaying between two sajdahs in infaradi salaat?

When he sat down in-between the two sajdahs, he started thinking of something. In order words, if a person unintentionally delays in executing a particular posture or gets delayed due to thinking of something, then sajdah-e-sahw becomes wajib.[Bahishti Zewar]. Sir, in infaradi (alone) salaat ,I make intentional delay in Jalsa (between two sajda) to have a good posture or to recite tasbih (Allahummaghfirli). Is there any harm ? Although ,in Congregation salaat, I maintain pace to follow Imam in executing step.