Sourdough rising but not doubling

I started my sourdough starter on 6/15/22 with fresh ground WW. Since then I have been feeding KA unbleached AP. It took about 2 weeks to see its first rise. Smells sour and slightly sweet. However, I have noticed for about a weeks now, when it rises, it only rises about 1/4” over 24 hours. I have been doing the following:

Once daily stirring and discarding 1/2 of starter (keeping 1/2 cup in the jar) and feeding 1/2c KA unbleached AP and 1/4c water. It would take about 24 hours to rise 1/4” around 75 degrees.

Last night I tried something different. Discarded all but 1/2 c starter, added 1 c flour and 1/2c water. It took about 15 hours to rise and start falling, but only rose 1/2”.

Should I try feeding a higher ratio of flour and water to starter? I live in a very warm climate (south texas), but my house stays fairly cool. 

Any advice would be appreciated. I have high hopes for this starter and I’m really want to make bread because it’s been 3 weeks since creating it.