I'll add a couple of observations to the OP.
1. The Spurs do have 10 back-to-back sets, but:
a. only one of those presents a 4 games in 5 nights schedule, and that comes next week with games at Detroit, at Toronto, at Philadelphia, and at Washington -- as 4-in-5's go, that is far from the most brutal a team could face. There is also only one 5-in-7, but it's a bit more daunting:
3/31 v. BOS
4/1 @ HOU
4/3 v. PNX
4/5 @ ATL
4/6 v. SAC
b. to go along with the absence of 4-in-5's, the remaining back-to-backs are relatively well spaced; after playing 3 back-to-backs between February 3 and February 12, the Spurs have roughly week between every back-to-back set with only 1 exception.
c. of the 2nd nights, most are against teams that are currently under .500. The 10 second nights left are: @ SAC, @ TOR, @ WAS, @ CLE, @ HOU, v. CHA, v. PRT, @ HOU, v. SAC, @ PNX. Of those teams, only Portland is currently above .500.
d. the Spurs have 8 games left against teams that are playing on the 2nd nights of back-to-backs and almost all of those will be at home, including the remaining home games against Oklahoma City (which plays the Clippers at home the night before) and Miami (which plays at Orlando the night before):
Feb. 9 -- @ TOR
Feb. 23 -- v. OKC
Feb. 27 -- v. MEM
Mar. 4 -- v. MIA
Mar. 19 -- v. CHA
Mar. 21 -- v. GST
Mar. 28 -- v. PRT
Apr. 6 -- v. SAC
2. As of today, the Spurs have 17 games remaining with teams that are under .500 and 18 against teams with winning records. That dynamic will shift as the RRT runs its course; by the All-Star Break, the Spurs will have 15 games left with teams above .500 and only 11 left with teams under .500. Of the 15 left with teams above .500, 8 are against teams that are above .600; also 8 of the 15 will be on the road (almost all post-RRT road games are against teams that are over .500).
3. All of that could be worse. The Lakers, by comparison, have 34 games remaining as of today (2/1) and 23 of those are against teams that are over .500 (13 of those are on the road). They have 15 of the 23 coming against teams that are over .600. In fact, by opponents' winning percentage, only Sacramento plays a more difficult closing schedule. They only have 6 back-to-backs left, but they have a b-t-b next week that is a 4-in-5 going from Boston to New York to Orlando before concluding in Charlotte. There's also a 5-in-7 that includes games with Dallas, Utah, and Denver.