Lynn,
Great to get an update from you and congratulations on the progress and your consistency.
I can see your dilemma with the palms-facing incline DB press. If you choose not to purchase more DB's, then I'd suggest doing that lift when the program calls for higher reps and doing a regular incline barbell bench press on the low rep days.
For chin-ups, a chin-up bar is just so easy and inexpensive to put up. A piece of pipe and two brackets from Home Depot and 10 minutes of work. A chin-up feels a lot different from a lat pulldown, even though the target muscles are similar. The chin-up is much more of a whole body lift. In the meantime, do the lat pulldown with either a V-handle (so you can use a close grip) or an underhand chin-up grip until you get your chin-up bar set up.
Have fun with those dips and towel curls.
