[ROL]

I have always been surprised at how much detail I can get from a thin negative. Try it, you might be pleasantly surprised too.


Steve.

Agreed, entirely.


But here's something else. You should try to print them, in order to decide for yourself. PRACTICE makes perfect – even, or especially, if imperfect to begin with.

Your stated (probably) insignificant increase of development temperature at recommended time and developer should have resulted in a denser negative. Your impression of their thinness may:

1) be incorrect – that's why you should print them yourself.
2) indicate incorrect timing, thermometer readings, expired chemicals – in short anything in the process not operating incorrectly.
3) be the result of underexposure of the film itself, either by you or the taking device or light meter.