Small pool, Chlorine level is driving me nuts.

[Greenfrog]

I am a new pool owner, purchased a short-sale home, so I got ZERO info from previous owner.
The pool is an excercise pool with built in Badu swim jets, approx 4200 gallons. I cannot seem to get the chlorine right, and it has not a "Bad" smell, but it doesnt have that nice clean chlorine smell either. Others have told me the pool smells "different" from most pools they swim in.

I use the LaMotte 2056 ColorQ Pro 7 Digital Pool Water Test Kit which seems to be accurate.

I use Calcium Hypochlorite granules for sanitizing, Sodium Persulfate for shocking and Cyanuric acid for Sablizer.

Latest test results:
FCL: .18
Total CL: .36
pH: 7.5
ALK: 134
HRD: 314
CYA: 71

Here is the problem: My pool chem app advises me to add CL, but when I do, the next test always says "Combined chlorine concentration is above recommended levels. add Monopersulfate" which I do, which seems to drop the CL again, and the cycle repeats when I add more CL.
Ive never seen my Free CL level above .4 (POINT 4) and I think it should be around 3 or 4 correct?
Any suggestions?

More info. Inground INDOOR pool, not sure what the liner is made of, seems fiberglass like. Circ pump on about 6 hours a day. the pool is not used much, only about 1 hour a day, and we keep it heated to 85 degrees.