Coreg and Lisinopril dosage for LBBB?

[Ned2No]

78 year old active male diagnosed with LBBB, cause unknown suspect virus or stress related.
Never had hypertension.  It was always 117+-/68+-.  First EF test revealed 35-40%.  
Upon taking Coreg @ 3.25mg and Lisinopril @ 2.5mg the EF improved to 45-50%.
3 months later the EF went down again to 35-40%.  There is no congestive heart failure.
There was no evidence of a heart attack.  No diabetes, renal or liver disfunction.
My new cardiologist suggests increasing the Coreg and Lisinopril due to my evident tolerance.
After 3 months the doctor didn't think it necessary to have an Echo Cardiogram because the body
tolerated the increase and everything should be fine.  His treatment plan includes incremental increases
in both meds without an Echo Cardiogram test until one 1 years time.
The Lisinopril 10mg was increased from 5mg to 10mg 3.5 months ago.
The Coreg was increased from 3.25mg to 6.5mg over 1 year ago.
The current Coreg dosage is 6.25mg 2x daily and Lisinopril 10mg 1x daily.
During the office visit today the doctor wants to increase the Coreg to 12.5
and wait on the increase of the Lisinopril till 3 months time,
My thought is that unless a medication isn't performing as intended it then can be increased to
the established historical evidential history of that drug.  If on the on the other hand, the drug is
performing as prescribed I believe it should not be increase until body response or appropriate
testing suggest so.
Any and all input heartily appreciated; :-).