Newcastle United were not at their best on Tuesday night. While Eddie Howe’s side at least booked their spot in the FA Cup quarter-finals, it was not pretty for Newcastle. Indeed, playing a full-strength side (albeit injuries remain) and only squeezing past a team well below mid-table in the Championship is not exactly a great look. Howe did tinker at least. While much has been made about his use of full-backs this season amid Dan Burn’s lack of form and Lewis Hall’s complete lack of gametime, the Magpies boss did change things around somewhat at Ewood Park. Kieran Trippier, as noted by The At…