Hello and welcome to BW:)
Our EASY is more like EAEASY because I'm very paranoid at my supply being affected by the longer time between feedings.
I did the same thing. It is absolutely fine. Around 7 months, after solids were quite established, I found DD was not interested in some of the top up breast feeds, and so I cut those out.
The first couple days were rough and on day 3 and 4 she did wonderfully! Went right down without a fuss and napped 1.5-2 hours! The last 2 days she's fallen right back in with needing Sh/pat and PUPD. Then she naps for 30-45 minutes. I have no idea what went wrong.
This seems very normal to me. It is common for things to fall in and out of place all the time. Since you are just starting out, you would need to keep going consistently for a week or two before you can see any changes. I found the same with my DD - everything would fall into place almost immediately, and then 3 days later the fussing would begin:p I just kept plodding on.
So in the routine you have posted, you seem to be doing an A of 2.45 - that might be a bit much at 5 months (not necessarily though as A times move VERY quickly between 5 & 6 months) Could you post a few days in a row for me to see - morning and night? It helps to look at the entire picture when forming a routine.
Don't worry - things will fall back into place if you follow your plan consistently, and we'll work on your routine (if any tweaks are needed)
Xx