How long have you been working out?
If you can't feel the targeted muscle-groups working when performing bench press or lat pulls, then most likely the fault is with your form/weight-number and not so much the lack of pre-exhaustion.
Pre-exhaustion is a good tool to use for lifters who fear their muscle have gotten accustomed to a certain routine or exercise(compounds), so they pre-exhaust it using an isolation movement. I don't think that is your problem nor solution.
Like I said, I think it's form/too-heavy-of-a-weight issue. There are however some things you can do to help your form.
For example, for your Lats, you can utilize the 'Straight-Arm Lat Pulldown' which I used for the first 2-3 months until I realized how to target my Lats.