+1, i agree....
Maybe start conservative and see how it goes.
Get a good feeling for the calibration of your voltmeter to measure correctly. It's easy to raise a level later, but overcharging can not be undone. E.g. 4.15 is really close to the absolute upper limit and the least inaccuracy in the system could send you over the top. So set it at 4.000 and see how well it meets this and how good your meter is at measuring and verifying this. Then you can increase the level and limit it you feel that you need higher.