I can remember a starter that I fed one night, just before bed, so that I could make lots of pancakes in the am.  When I got up it had crawled out of the crock, up the wall, across the window sill, and was heading up the window!  Geeeze.  Lively sucker!  Luckily I had enough left for pancakes! 

I thought my fingers especially my thumbs were going to cramp doing the stretching and folding a la Richard Bertinet. It didn't take 15 minutes, took me 30 minutes at least, had to rest in between!

I wouldn't have the patience to spend 30 min folding a dough, even with a break.  Why not try a different method?  Mix it up and let it just sit 30 minutes.  Then do a little folding or light kneading for a few minutes to blend and form a smooth dough.   Try it and see if it makes a difference. 

Sounds like you can reduce your amount of starter to smaller amounts and double up on the flour, so it doesn't go thru the food so fast.   Find a cooler place to let it stand so you only have to feed once a day.  Now that you're familiar with what it looks like when it peaks, you adjust the feedings to meet more to your schedule.

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