How long have you been watching TCM? I ask because it sounds like for only a month or two.
August is always Summer Under the Stars; This means ONE actor each day. This is why Davis was on all day (for example).
Prior to this TCM had a special related to westerns. This is why they showed a lot of westerns BUT we can expect less in the near future now that this special is over.
Bottom Line is that TCM does have specialty programming like Star of the Month (one 'star' featured in a month, all day, one day a week, so 4 - 5 days in that month).
Otherwise their programming is 85% or so pre-1970 films mostly from Warner Bros, MGM, and RKO with Paramount, Columbia, 20th Century Fox and Universal a lot less often (due to leasing 'issues' with these studios).
Good post james. I suggest the OP wait another month or two before giving up on TCM. Throughout the year, there is plenty of variety.