It depends on what you prefer really. Some players like to boost the stats that are good, for example putting Shadow on a defender like Kyle Walker who is already quick and good at defending.
It is my personal preference to boost the stats that are lacking. For example:
91 PAC 85 DRI
79 SHO 41 DEF
70 PAS 74 PHY
Shooting, passing and physical are the stats that kind of need a boost in my opinion, so you could use either Architect (+PAS, +PHY), Finisher (+SHO, +PHY), or Deadeye (+SHO, +PAS)
I'd go for Finisher, only because in the LF position he is going to need better shooting than that, and added strength which will help him shrug off defenders which complements his already quick pace.
As per futhead, it would turn his stats to this:
91 PAC 85 DRI
88 SHO 41 DEF
70 PAS 81 PHY
With futhead you can even see which individual stats get boosted. Here are some important ones:
Finishing 81 > 86
Shot Power 84 > 99
Long Shots 70 > 85
Strength 76 > 86
You could use Hunter (+PAC, +SHO) but I don't feel that the full benefits of each chem style would be reaped seeing as his pace is already quick enough to beat a defender.
Not only are special chem card with pace expensive but people often use them impractically. Do you need catalyst on your central midfielder who already has 80-odd pace? Do they really need to be running at full speed to do their job effectively? These are the questions you ought to ask yourself before you spent 3,000 coins on a chemistry style. The cost really adds up when 3,000 x 11 = 33,000. 33k that could be much better spent, in my opinion.