No offense and not intended as an argument to discredit your story, but UK vendors are usually the 'fullest of shit' when it comes to RCs. It is possibly one of the reasons a lot of very shitty RCs are used in great quantities in the UK, but find almost no niche on the mainland.
I am hardly using 4-FMP by itself anymore, and since I am not really fond of stimulants in general my dosage seems to be on the low end of the scale. I always liked dosing 4-FMP at 60-80 mg, sometimes 25-40 mg when working on my thesis (= study aid); I already noticed increased appreciation for music at 30+ mg. The 4-FMP + MDMC combo has been tried a few times in the past, it is nice but only if you like a lot of stimulation. If you would like to try, I suggest you go for your normal dose of 4-FMP (100-120 mg seems perfect) and take some 150-250 mg MDMC about 2 hours after the coming-up (= approximately 2.5-3 hours after initial dosing). Just keep yourself from compulsive redosing, might be tricky with MDMC in the equation...
My personal favorite use of 4-FMP is in combination with the intermediate length 2Cs. 2C-I takes the cake, but 2C-E and 2C-T-2 are also very nice. My favorite combination was any two of 2C-I/2C-E/LSD with an inital dose of 50-65 mg of 4-FMP; supplement of 30-40 mg 4-FMP 6 hours in, sometimes with an odd 6-8 mgs of 2C-E/I. Super colourful and sophisticated CEVs (dancing Barbie army consisting of 10,000+ Barbies LOL), clearheadedness when needed but trippy if you let it. Hardly any fatigue, no excessive stimulation, just a somewhat 'natural' energetic feeling. Of course this combination will not have the same effects for everyone, but all my friend are also liking it a lot.